Malicious PDF — malware analysis report

Static analysis result for SHA-256 9063985955e64325…

MALICIOUS

PDF

70.4 KB Created: 2021-04-02 11:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 60d663555526ffed6dd300c54329c100 SHA-1: bada7794e153794f8ccf037fdc668612c9107410 SHA-256: 9063985955e6432554b134b5e36088ffe8c361d3d274b92baeb77427310409d8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards the use of embedded JavaScript for redirecting users to URLs like 'https://jumiwimov.ru/wix?keyword=amsco+ap+us+history+2016'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/wix?keyword=amsco+ap+us+history+2016 PDF link annotation
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/117eb360f7aa8a5.pdfIn PDF document text
    • https://makumanufomogo.weebly.com/uploads/1/3/0/8/130874647/zemigojut_temorabaduvi_xugaxur.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/rebibekol.pdfIn PDF document text
    • https://fofonamid.weebly.com/uploads/1/3/4/8/134869219/3c058c10811c66.pdfIn PDF document text
    • https://fawewetipe.weebly.com/uploads/1/3/1/3/131379545/1008412.pdfIn PDF document text
    • https://kalujobad.weebly.com/uploads/1/3/4/3/134390175/6c08bad759312e4.pdfIn PDF document text
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/e91aad06.pdfIn PDF document text
    • https://sosedegif.weebly.com/uploads/1/3/2/8/132815053/4779234.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_aa37870862ff4eff8587180ba77e5006.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_058d90a4e4bc47f8b2b7095b626d0317.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/piradi/lazogidosarab.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/zokepisarodot.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_cce091ae09894c6e9eec310d97863140.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_e222b21673b54092b0645350c2af869c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f4013c6-861c-426f-a5a0-f5d72ae827d4/88568673296.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/vixikolamemegoda.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_76386c1f82754f65a9e43acf4b834960.pdf?index=trueIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_34ae6abe06894456ac34c9a0dddbd198.pdf?index=trueIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_c0d5dc0e2e2049ed95439ebf6aa61da5.pdf?index=trueIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_56da40ae836d47c99dcde4a168cb98d6.pdf?index=trueIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_571344f8ad544d8ea47a96de75c96edb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/how_to_score_the_celf_preschool_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecec50d3-2ab7-4793-b2b3-8195f6b6c974/momategekebumupa.pdfIn 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_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 5712 bytes
SHA-256: 61127ce4919bcdcd12526efad1a8082db9277ae789aecf1748de457df50f246a
font_01_sfnt_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 10572 bytes
SHA-256: f447e6950e4ac9d5decefe82cba634522c32502ad29c2a54c9ef3a660655d63d

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