Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd91478bec9e652a…

MALICIOUS

PDF

133.7 KB Created: 2021-02-18 02:46:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 454ef906f199d4c9838524c34354528e SHA-1: d7afb9d90d95d2f3573af4f9f0ea14cb5f9b21ac SHA-256: dd91478bec9e652a12278ad80b807d0ecf90d05df59180174ff3c4c6bbb028a6
234 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious or SEO-manipulated content, as indicated by the PDF_SEO_LINK_FARM heuristic. One critical heuristic also flags a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection further support the malicious nature of this document, suggesting it is a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • 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.
  • 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://crophysi.ru/wix?keyword=warlords+call+to+arms+hacked+unblocked In PDF document text
    • https://static.s123-cdn-static.com/uploads/4382629/normal_5fca6de7da57a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453741/normal_5feb411f46317.pdfIn PDF document text
    • https://cdn.sqhk.co/poluxofad/igBhhhf/rally_car_tracks_near_me.pdfIn PDF document text
    • https://nujawarasut.weebly.com/uploads/1/3/4/3/134310583/gatewosojuvot-logosapiniz.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/rapewam.pdfIn PDF document text
    • https://nugilura.weebly.com/uploads/1/3/5/3/135317706/ec72097dfd.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/6322083.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/TPUzjeN/28081014676.pdfIn PDF document text
    • https://cdn.sqhk.co/xojurolaruk/idxijhh/los_sims_mobile_hack_apk.pdfIn PDF document text
    • https://dogaralezuj.weebly.com/uploads/1/3/1/6/131637140/8149460.pdfIn PDF document text
    • http://kenufapozij.22web.org/technical_report_definition_and_characteristics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383586/normal_5fe43bd77f711.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
    • http://makijozexu.rf.gd/vutuzeli.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/final_fantasy_dissidia_012_battlegen_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/raraduxokuwavoz.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/90249425970.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/56968700288.pdfIn PDF document text
    • http://soxomidil.epizy.com/gold_etf_fact_sheet.pdfIn PDF document text
    • http://numakuzugurewi.rf.gd/anyways_messenger_for_android.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A063 9988 bytes
SHA-256: a7b2b19cad2f6a06547916b26c882d43adbd88a273a22f607881362a167fb61e
font_01_sfnt_off0001c154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C154 5232 bytes
SHA-256: 7f9f5d9b15cdecc2fb6a3d0b842862ea58ee8ad7b86cca3e1dce25ea0cc494e2
font_02_sfnt_off0001d2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2F9 11412 bytes
SHA-256: 8210f12b311963bdd518f472279d1426426311296d104840a211ab2171c910b7
font_03_sfnt_off0001fa0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA0A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34