Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc4d74d63c6382c…

MALICIOUS

PDF

69.3 KB Created: 2021-04-05 05:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ca240c56838eeb8272279db6cef2d6a0 SHA-1: c51feae80927099908cf4743cc9947da71bb05fb SHA-256: 4bc4d74d63c6382c85114edeed7e9ae4008b208ce072bde63a3838cc1e8a6e2f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The embedded document body, though heavily obfuscated, contains keywords related to search engine optimization and potentially lures users to malicious sites like 'nipisod.ru'. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/award?keyword=breast+cancer+information+in+marathi+pdf PDF link annotation
    • http://rokuboxajiga.medianewsonline.com/betaseleb.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/is_navy_corpsman_a_school_hard.pdfIn PDF document text
    • http://posadukik.getenjoyment.net/60802068806.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4afcb01c-ea81-48ae-981a-6d71bcda9c9c/sexatozixogipuwoxafiwikez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d5bc41-a35e-4db7-abd7-a6aa028c16b4/811019799.pdfIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_13204acf523445e197f498a0d5fadd4c.pdf?index=trueIn PDF document text
    • http://giworutiw.myartsonline.com/purerekajijusobojeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62aac801-c3de-4fb8-b30c-2e99382a2e4e/fixuxenij.pdfIn PDF document text
    • http://dufobirufo.atwebpages.com/networking_questions_download.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_38a20b46fb4a4ab48bbef3f7476fd859.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da1cdc4-0fb9-44c6-a828-fb523a7ccd52/troy_bilt_xp_7000_generator_oil_change.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_1d9e6ea253ba4ce9b9596dcc634d14e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93bb260a-1b66-4738-bbfe-4a34ea93a599/lurupese.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_3759cf05aa5c4c03a78fb1ff22f8c68e.pdf?index=trueIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_9519768776e64621bba2bce5c5d23bdc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe8d59d-b1cd-46f9-ba3e-821d542403ea/how_to_repair_ice_maker_in_kenmore_refrigerator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73936c0b-88ce-428c-8966-f3896a2aebc5/bully_dog_gt_tuner_diesel_review.pdfIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_8c3e269891b148cfb86cb20ae63a2366.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_e69a60ab07954552851f7da0e478024f.pdf?index=trueIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_91411f0d31294ce3b7f91af31fe5b18f.pdf?index=trueIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_21dd98da554347af8132387881262013.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98410357-27ec-4fe4-8d40-78cbaeaf6828/11466875330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada30f26-7f17-48c9-9ea7-02d358e9d22c/96708990537.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_82d71028fc6e436c8ac71a3518331eff.pdf?index=trueIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_46348768b08149e5acc76405e186ff62.pdf?index=trueIn PDF document text
    • https://medlineplus.gov/breastcancer.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24C 5412 bytes
SHA-256: bb1d286a1de976a16f6266641ab95607530132a98b95e8584cb52c34461c0870
font_01_sfnt_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 10200 bytes
SHA-256: 503a46297e363a2603022dc0b28119721c80d3048f20258b4c54be158bc25c8e

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