Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e404a5bcc5444e…

MALICIOUS

PDF

75.2 KB Created: 2021-03-18 17:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d8e044efad6963a104def7762956fcf1 SHA-1: 5bf0b9d22af6170c054d557ca7b490fb6439b9a4 SHA-256: f7e404a5bcc5444ef7ea05140de7987b00cc970453bd88ec47bd5495e00e4859
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an external URI pointing to a link farm, which is a common tactic for SEO poisoning or distributing further malicious content. The PDF also exhibits characteristics of a link farm on disposable hosting, further supporting its role in a malicious distribution scheme.

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 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://pelibifir.ru/wix?keyword=botany+in+a+day+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412403/normal_5ffd551dc5155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379846/normal_603a712661ad5.pdfIn PDF document text
    • https://cdn.sqhk.co/xarebovave/bjiJ3c0/pewogimojotodumajijax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388620/normal_5fdb32414f366.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/fhcy1sC/all_stars_cricket_match_2020_teams.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b092e09-b7e6-4407-a8d2-74addf0691dc/how_to_answer_social_security_disability_function_report.pdfIn PDF document text
    • http://tarojax.epizy.com/lasogoxevez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50700e4b-154e-4179-99dd-56f4897aaae4/97637983902.pdfIn PDF document text
    • http://tetexamafikej.epizy.com/59317321942.pdfIn PDF document text
    • http://savopabefiw.epizy.com/how_to_draw_eyes_cartoonish.pdfIn PDF document text
    • http://kujujonagojatu.epizy.com/aqa_biology_oxford_textbook_answers.pdfIn PDF document text
    • http://binukotusaboz.epizy.com/bhootnath_return_movie_song.pdfIn PDF document text
    • http://panejolaraluka.rf.gd/welepaxuxadomevuvuwajalo.pdfIn PDF document text
    • http://sogefotasir.epizy.com/the_gospel_according_to_mary_magdalene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/695acd4a-edbd-42fb-b56c-610129133227/dapilekusosenosupivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3986449a-a204-4e6b-bbfd-969b0123283b/wevafoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5417d14f-1cdd-45ac-af6f-7b6f0e77f040/40606794591.pdfIn PDF document text
    • http://bowawimuwojigaf.rf.gd/60422618459.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_off0000e8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 4880 bytes
SHA-256: ca28a2e2c4a3110579bfe551c7726563e4f7003b12f325a18cd84b38fd537979
font_01_sfnt_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 11120 bytes
SHA-256: 231778a95e3f7696956519788d266722a1630820fb211daf5888fe2d2ee74dd9

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