Malicious PDF — malware analysis report

Static analysis result for SHA-256 72333722bd6660a9…

MALICIOUS

PDF

64.8 KB Created: 2020-12-10 21:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6162aaef444e3437bc7be1121c2b2cd7 SHA-1: 984f6e156aa4c2b47070e75ca125623050cee225 SHA-256: 72333722bd6660a97f35825f234a5efba00aa3c4fffacb4a33e32a4ee36b5492
274 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified as a credential phishing lure impersonating a brand. The presence of multiple PDF link farm heuristics and a critical ClamAV detection further supports its malicious nature. The document body, though heavily obfuscated, appears to be a lure related to 'inquiry into scientific thinking worksheet answers'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://pusazaninad.weebly.com/uploads/1/3/4/3/134358808/3168826.pdf.
  • 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://cctraff.ru/123?utm_term=inquiry+into+scientific+thinking+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_5f8b5d7ea5364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482002/normal_5fb4bfd44503c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482020/normal_5fb8a98660a93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413578/normal_5fb86346afa7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383149/normal_5f9d1646878bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501775/normal_5fc8500733ef5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5f94a0bca6d38.pdfIn PDF document text
    • https://pusazaninad.weebly.com/uploads/1/3/4/3/134358808/3168826.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://static1.squarespace.com/static/5fc3797e5e8e827d429e31b4/t/5fc7af0048d5672cfb477d23/1606921984930/jaranaf.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/sunabod.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a453cd1e280355df5d9e/t/5fcc51bf05ddc9599d169114/1607225794416/snapchat_emoji_pink_heart_to_yellow_heart.pdfIn PDF document text
    • https://s3.amazonaws.com/bunobu/goodyear_eagle_ls2_275_55r20_sams_club.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/69777861049.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_off0000b336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB336 5316 bytes
SHA-256: 17fe6b93847a925e6f62869262dcc1af9c8a57cd0a4c12ba5bb27c1e34c29967
font_01_sfnt_off0000c55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55D 10204 bytes
SHA-256: 75a8dcff6b0b0f3e8cb9148049d8f43adeec857a0998b721adb8a89e74dbd576
font_02_sfnt_off0000e807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE807 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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