Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8aef0961485417a…

MALICIOUS

PDF

71.7 KB Created: 2021-02-28 17:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f584c261cd95538070a0cfdf1f7a8800 SHA-1: 22d4c0b7be53acffdb70b12fb07d2ac8b4c1404a SHA-256: a8aef0961485417aeac2c129b2d30934be385456f08124a59616c272144bc8fe
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicative of a link farm or SEO poisoning tactic. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a phone number. While no scripts were explicitly extracted, the presence of PDF-specific exploits and a high ML classifier score point towards malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://maypoin.ru/123?utm_term=lawn+boy+customer+service+phone+number PDF link annotation
    • https://monowulesamewul.weebly.com/uploads/1/3/2/6/132682048/60b3afb.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/cjjTn5R/jukoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421039/normal_601e213d1fce3.pdfIn PDF document text
    • https://libepuve.weebly.com/uploads/1/3/1/4/131407284/forimive.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/fW9iQ1a/kapunizaz.pdfIn PDF document text
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/8715184.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/99277332848.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/84072680484.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/Pgggdja/80092525523.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://s3.amazonaws.com/pidufozu/2d_wavelet_transform_python.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/asphalt_7_1001_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/utorrent_takatak_marathi_movies_free_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/pasobupubama.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/55404947174.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/food_costing_spreadsheet_templates.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_off0000cea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA6 5360 bytes
SHA-256: 3854f60ecde1e116ddd7fa8ab38201769cd5cdf7f8e5e71098cbc3bd9ce204c1
font_01_sfnt_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 10264 bytes
SHA-256: 47262f6b8363d457d9b0bbd4852688afda7bbe05ce61f2daae7cce8c13195f70
font_02_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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