Malicious PDF — malware analysis report

Static analysis result for SHA-256 af04741b9aaceb5a…

MALICIOUS

PDF

75.5 KB Created: 2020-12-18 01:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e74c1c9531fb8263584caf4c3b2b170b SHA-1: 1268a68be8281ee679fe34971dfab997ecba5d69 SHA-256: af04741b9aaceb5afc8373fa3ba7f28ea0530970df9b838d1b66d75e501d8819
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ggtraff.ru/strik?utm_term=fiverr+promo+code+2020+uk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_5fba6ec418bdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408873/normal_5fd2a8c2b8273.pdfIn PDF document text
    • https://nimimemuxigu.weebly.com/uploads/1/3/4/4/134488465/ef472da0b3.pdfIn PDF document text
    • https://dawugagulinejud.weebly.com/uploads/1/3/4/3/134368664/negidefesoj.pdfIn PDF document text
    • https://tujonodup.weebly.com/uploads/1/3/4/7/134717107/44140813.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/ridotumak_fuxipakov.pdfIn PDF document text
    • https://wolofineso.weebly.com/uploads/1/3/4/5/134598063/1163625.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0d6092e537a05ef08bc6e/t/5fc149cb2dd96f59181ecf62/1606502861935/27848050568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35905da7-c480-4f87-a6ae-fcbd2b291563/pid_simulator_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/barbie_doll_cartoon_karo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf0369b1ed035389f7288/1606283318887/plantronics_voyager_pro_hd_wireless_bluetooth_headset_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8011e289-78fa-4ff4-9abc-8c5eb80fa979/lomufomijuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae0d01f-d393-4bc9-84a9-adaef9aaa65b/buffalo_revolver_and_rifle_club.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd064fef3361272aed614d/1606223439474/the_infinite_sea_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc376e18139af0376556c03/t/5fc531504f9837572086d944/1606758737260/88573950355.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_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 5152 bytes
SHA-256: 67612261ff6dd1267aa9c3f879433fedab34b108e850cea80413ae94d6352fc2
font_01_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 11844 bytes
SHA-256: 9cb65014ec89111d5578a389e1961c6d01604f6c86d25dfbb0d5e7f03c92cea3

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