Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9943637544449e…

MALICIOUS

PDF

80.9 KB Created: 2021-01-14 23:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2628acb3dfd4d99d4fe9e5d268208ab5 SHA-1: 68b1c1641519a6b75be68927b7d45f463f47ee95 SHA-256: bf9943637544449e06e9ebcf7f713abdec8d57359b96e24309e759f706a675b2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafficel.ru/aws?utm_term=reflective+report+writing+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5f8f3d7785992.pdfIn PDF document text
    • https://cdn.sqhk.co/woxezelej/ieIidib/shortcut_run_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490953/normal_5fd9fea46902f.pdfIn PDF document text
    • https://cdn.sqhk.co/gapirofi/hihijcY/free_video_calling_imo_apps_download.pdfIn PDF document text
    • https://sowozulame.weebly.com/uploads/1/3/4/7/134733070/7690012.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/iIK5iao/2020_election_ballot_nassau_county_ny.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_5fbae57dd3c90.pdfIn PDF document text
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/mejobigurovekib-revut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451940/normal_5fa4fe004b65b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417206/normal_5fc6a0b09a70c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470681/normal_5fbc314868b90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f86f9e2f0f10.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/hecghtH/gymshark_simulator_roblox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/geradi/denomitodazit.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/ap_calculus_problem_set_48_answers.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_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 5316 bytes
SHA-256: 6805798b754f63f4fcb497c452acd88ad208610439e611facfa983c1465f3b69
font_01_sfnt_off000111b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 10720 bytes
SHA-256: 2dee5f694ac6904000fbce6693ac94c450783deb1c32fac22b88a032562c151b

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