Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b653abc1629002d…

MALICIOUS

PDF

78.6 KB Created: 2021-05-28 08:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 386657ce41f1b52e383849cbb967d3ef SHA-1: 25e815f0ed0f8c26dea6d4d7caf49c771503412c SHA-256: 9b653abc1629002dc748960b19cfa0bc7c80fc54ba75c452856fd454de2fe1a7
206 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'SE_CALLBACK_LURE' indicates the document may also attempt to trick users into calling a phone number under the guise of a support or billing issue. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ponafet.ru/123?utm_term=army+food+handlers+course+answers PDF link annotation
    • https://talokawibameze.weebly.com/uploads/1/3/4/0/134000376/1143327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_601d20bfb9079.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/9576952.pdfIn PDF document text
    • https://juzemadarerux.weebly.com/uploads/1/3/1/4/131437885/zodipasud-rugolitiv.pdfIn PDF document text
    • https://gitokivoj.weebly.com/uploads/1/3/4/3/134316846/434821e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417128/normal_602283110f121.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448094/normal_6005572b4d31a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379859/normal_60052abd871cd.pdfIn PDF document text
    • https://warigiwedekepap.weebly.com/uploads/1/3/4/6/134655399/ddc9cd26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_5fd96be7a2202.pdfIn PDF document text
    • https://vosaxivuminol.weebly.com/uploads/1/3/4/3/134387598/jugemamo.pdfIn PDF document text
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/7081869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_601be2fe9b0bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387244/normal_6044d0ecaa9c2.pdfIn PDF document text
    • https://vozopameniv.weebly.com/uploads/1/3/4/5/134593493/06c7dfd305f93.pdfIn PDF document text
    • https://gevivefopunuxaf.weebly.com/uploads/1/3/4/3/134331765/wesadem.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/86cacdc5f43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369317/normal_600861ad772d0.pdfIn PDF document text
    • https://mekiwukokoviv.weebly.com/uploads/1/3/4/8/134867966/texegezipiju-jubuzepug-sivewapedoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412607/normal_6046400a09847.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/totarigemom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_6021fc4b7a518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_604175adb6429.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
    • 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_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 5200 bytes
SHA-256: ffacb81f5ea44e04fc59e74653a01e12edebaa61f8f047112e243cc7451ee1f0
font_01_sfnt_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 12060 bytes
SHA-256: 23ebdbf3f0c5bd2535fd0207756cb1ad5f311d1266008d47c03223968c1d39c6
font_02_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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