Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6d7474ef4ce7a8…

MALICIOUS

PDF

72.9 KB Created: 2021-03-16 01:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e4c64a90448dc987cc97644d0de19edc SHA-1: a62d4f99005f41f67d61529e578fb0ef67707f43 SHA-256: 2f6d7474ef4ce7a881e135e3b4eca76c6a8504dda555de63769eb0088580c7f2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection attempt, likely initiated via spearphishing attachment.

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://pelibifir.ru/wix?keyword=renewable+and+nonrenewable+resources+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495707/normal_604ce20d8d6e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449417/normal_603e5d8921bd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418783/normal_5ff11a6a6e559.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/0c5a067ac2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450045/normal_5fdfb71956a4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_601cff913e09a.pdfIn PDF document text
    • https://retumitoratosu.weebly.com/uploads/1/3/4/2/134234586/tefot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_6044243ca3e1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_601a9bc600ff7.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://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_f31172c6dd16409f86baddc708f389ef.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_d2d3ec4600bc47fa8b524128af9c2fe8.pdf?index=trueIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_ce4a6c35de8149788b32bd73df81780f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ac716ba-2797-4844-b653-ab5ea6f02fe6/music_theory_practice_test.pdfIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_f86fcfe57bdc4f64abdbeddef86a033c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f48f57d5-96eb-47fb-938c-d32328b42add/how_to_use_an_arm_blood_pressure_monitor.pdfIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_c431e51661fc4cbe9aa59aead352add2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a405638-e573-4190-8089-d545221ca5f0/snow_white_with_the_red_hair_s1_ep_13_eng_dub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11609637-54a6-4f43-9119-61b0095369f8/toy_scale_size_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6991687-dffc-4958-ad5b-d4798332f6a6/ps_vita_price_ebay.pdfIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_ba4a09d10c7749a8a2c0689bced58c8b.pdf?index=trueIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_7ef9b4ccf07948f99b66823fa60b9106.pdf?index=trueIn 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_off0000d2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F3 5164 bytes
SHA-256: dfd95b970dcba5f0e004fa19f1596c99905f9a12ee2b13c89b512b4a6a967643
font_01_sfnt_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 10180 bytes
SHA-256: e8406743145f4dceae24356f4ec8a6ab2f9a6bf4eb643e70cd430b0b196c51ce
font_02_sfnt_off00010773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10773 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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