Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3a49e980302451…

MALICIOUS

PDF

80.4 KB Created: 2021-03-18 06:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 41e53b549b61a1d5b4126ea282a3b229 SHA-1: c7fc85d233bd5d8f9465413d690f26ca722f3db9 SHA-256: 7b3a49e9803024512f7d1143605b4025c98ca20b5adb03a8207f4a9fb85b3d33
206 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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://midufefew.ru/wix?keyword=sussex+county+nj+food+pantry PDF link annotation
    • http://gejopuzebizovuk.iblogger.org/titezujivakenajoliden.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/tusinij-rivukojilix-bogelojuravo-risokadibu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426422/normal_5fddfe615aba0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_60176dee9e137.pdfIn PDF document text
    • https://cdn.sqhk.co/dijadive/fFntCtj/jobs_and_occupations_vocabulary_worksheets.pdfIn PDF document text
    • https://sofusosixep.weebly.com/uploads/1/3/4/4/134493363/4de8a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478703/normal_60388c5d8201d.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/a94fd3.pdfIn PDF document text
    • https://zurukuwimuso.weebly.com/uploads/1/3/4/3/134325804/ridejimekatamof_pazifilodezivit_nuruzarozamipi_sozolo.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/hevjgjh/dizivobilazenovu.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/167dc5411118736.pdfIn PDF document text
    • https://mumoporexebaxuz.weebly.com/uploads/1/3/4/3/134339912/4544296.pdfIn PDF document text
    • https://takatika.weebly.com/uploads/1/3/4/6/134605824/jaxideg-jexevu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_c9541230e50247cf8567bcd423a55ea6.pdf?index=trueIn PDF document text
    • http://kegapijev.rf.gd/53530779032.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_178c59d671d7450c9e61c9e2f3e4a854.pdf?index=trueIn PDF document text
    • http://fudewisukot.rf.gd/ascii_character_code_table.pdfIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_aacf28bef8d14d5390350275afe55ecc.pdf?index=trueIn PDF document text
    • http://jewukibasevot.rf.gd/zifizoxakomu.pdfIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_735b55c702434659ac94a2d5c9e0519c.pdf?index=trueIn PDF document text
    • http://tuvilijemuze.epizy.com/kexozolokoto.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 5468 bytes
SHA-256: 82359d980e195ae930d7e8abaf2f5271329ca3945e5ddee840e2d43ca3f5c26e
font_01_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 11568 bytes
SHA-256: b4f9bb108e1adb7a02a53807c7b99dd1a9488d3bf8cc40f61a13e2a20ebd0cb3