Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd7f90ce89772ed…

MALICIOUS

PDF

75.4 KB Created: 2021-03-31 11:39:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b742f9b918b1164b58dae431a02bef23 SHA-1: 709b654837ec5e0037a793f11bac72bd83e53e0e SHA-256: bbd7f90ce89772ed784a206d43e2f9b0c5c672861b430a9f205712e57b88aecf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. 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 0.9997

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://seumenha.ru/wix?keyword=a+check+is+a+formal+contract.+true+false PDF link annotation
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/1427527.pdfIn PDF document text
    • http://xovebud.mygamesonline.org/ansell_casey_life_skills_assessment.pdfIn PDF document text
    • https://mejebepagomuda.weebly.com/uploads/1/3/4/4/134494428/e01c5227376153.pdfIn PDF document text
    • http://jizerigozigalav.getenjoyment.net/88157498538.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381751/normal_5ffe97e244904.pdfIn PDF document text
    • https://vizijupazikek.weebly.com/uploads/1/3/2/8/132814338/8915750.pdfIn PDF document text
    • http://fonozuzaj.iblogger.org/d_d_expert_set_1983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460243/normal_60421d16b0470.pdfIn PDF document text
    • https://kupujusurigov.weebly.com/uploads/1/3/4/4/134471221/045876.pdfIn PDF document text
    • https://zamupegokeza.weebly.com/uploads/1/3/1/6/131637483/3178620.pdfIn PDF document text
    • http://kavupuv.iblogger.org/26765421279.pdfIn PDF document text
    • http://pawaridifos.iblogger.org/tufufejojifosaselo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426059/normal_6008efde974a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469623/normal_5fe5753c2e6fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biburusig.myartsonline.com/41743283904.pdfIn PDF document text
    • http://nafaradevofipaf.myartsonline.com/melemojibewefoxexawix.pdfIn PDF document text
    • http://dumumuvuxu.epizy.com/centrifugal_fan_design_book.pdfIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_ae44c7a1a5ef4c5f997fc99a84ccd53d.pdf?index=trueIn PDF document text
    • http://devuzobek.rf.gd/radio_bodor_sunda_cangehgar.pdfIn PDF document text
    • http://kunerev.epizy.com/christmas_invitations_templates_word.pdfIn PDF document text
    • https://bd04a250-715b-4db0-8087-55ec2f714cf5.filesusr.com/ugd/0c2191_0bf82512d05548dda8696c91db1fd9ff.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 5208 bytes
SHA-256: 6272986d8cec635195b98c7ebbae4cbca84f7edcad7e567d6ddae1878c2dbc0c
font_01_sfnt_off0000fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD96 10200 bytes
SHA-256: 1dfd05801a8bc4f749a0e4ba65c00539846ca22c644c5cb2c3620de41dc52928

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