Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8b412104860953…

MALICIOUS

PDF

76.5 KB Created: 2021-03-28 08:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a02a1fa7c49ebe98efd5a89737b05e7d SHA-1: 523db6c25bc5291227b265a0f829ba53fd98d74a SHA-256: cc8b412104860953f817f17961b901b936cc4c04c1e9ba0f6f70be3599b38397
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The embedded URLs are likely used to facilitate the distribution of further malicious content or to phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/award?keyword=origami+frog+pdf PDF link annotation
    • http://relodifalixogo.scienceontheweb.net/nojakenevawivuka.pdfIn PDF document text
    • http://pedugubugof.mywebcommunity.org/sun_salutation_poses_names.pdfIn PDF document text
    • http://mufinofol.scienceontheweb.net/convexity_of_a_bond.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/92824366769.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/49504386397.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/wiserixevelesupafuvukuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_485072e5c4894ae79d1eeb1a10fea072.pdf?index=trueIn PDF document text
    • https://eae964be-cf9f-49a8-9b2f-00020d526acb.filesusr.com/ugd/e932cf_78e52d7d62e442fd8c15c42b3d8457be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51be9006-ea1b-44aa-9bc2-f1dcd532d474/physics_for_scientists_and_engineers_10th_answer.pdfIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_976e4eee75de48e88130a45318a61284.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ed380c-399b-4935-abb5-c3c8e3780883/culinary_arts_lesson_plans_for_high_school_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ced18de7-3e44-4615-b1b0-c59e0398e780/free_online_crossword_puzzle_maker_for_teachers.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_5f0ce68d1ac54449aad1b22a875a14fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e532498-c37c-4aa4-a953-fc0e8b407569/is_the_japanese_stock_market_open_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117f1f97-0c39-419c-bb0e-ef20805d5b07/17969162285.pdfIn PDF document text
    • http://riledabetime.myartsonline.com/69171797745.pdfIn PDF document text
    • https://b3695a61-a5b7-457a-863f-99677d03e0cc.filesusr.com/ugd/f2a82d_08734687d5624530b82ed6459f4f6e3f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76eb1e56-7c73-4cf4-960d-7128da6d6a11/math_textbook_for_5th_grade.pdfIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_377e3b70942e4b0399962440e67f3137.pdf?index=trueIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_0b357a05f3264db6846df73c97bef9c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd98b64b-eb92-42ad-8b37-7181b5936a1a/how_do_i_make_a_smoothie_with_frozen_fruit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 4664 bytes
SHA-256: 0393c1fb6561dfba733f296c9023211b12b8d74d51de4c59752b8b8cd1928214
font_01_sfnt_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 10728 bytes
SHA-256: 47083358c4e78e45aa319996c9643c7b55986540eeab771421ddd4f65b17ac93
font_02_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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