Malicious PDF — malware analysis report

Static analysis result for SHA-256 372bcd395c00ca06…

MALICIOUS

PDF

73.4 KB Created: 2021-02-10 18:57:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dffc870bac0f42f466ad6a9a1885db9e SHA-1: 4ec7edbbe9bedbf0dcf70f6275f456e8db9a069f SHA-256: 372bcd395c00ca06b7f238ee16ac8853c14d7852b7628373371ba7e433156fff
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farming and potentially distributing malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of external links, and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The embedded URLs likely lead to phishing sites or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/123?utm_term=9th+grade+vocabulary+word+list+pdf PDF link annotation
    • http://kigowamukidiba.iblogger.org/85497467498.pdfIn PDF document text
    • https://zetakopazo.weebly.com/uploads/1/3/5/3/135351561/muwepewaguserobirovu.pdfIn PDF document text
    • https://cdn.sqhk.co/zufosupiz/j4bhggh/music_equalizer_lite_ultra_sound_bass_boosters.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/Tia0haa/dadefasoworofegumopup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_6022591323643.pdfIn PDF document text
    • https://tarimewisu.weebly.com/uploads/1/3/0/7/130739021/73afd406ee412b.pdfIn PDF document text
    • https://cdn.sqhk.co/nezupusovefi/iiijEia/rufon.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/Ya2gije/75594366072.pdfIn PDF document text
    • https://cdn.sqhk.co/poladejug/ghJTbyo/top_10_young_players_fifa_20.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/sebunuzu/sociala_reformer_betyder.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/58409803287.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/tewepokonituz.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/bonafide_certificate_for_minority_scholarship.pdfIn PDF document text
    • http://jefusebu.epizy.com/fagemiworuxogufefititerun.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_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 5872 bytes
SHA-256: 0a843e47031befa187cdf62ff0ca6cdf6ef0bae5a8f1fda00979451ca6bbb060
font_01_sfnt_off0000f5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C3 10120 bytes
SHA-256: f30c621b37b83f217dfbecaf781c642c77bc37429209cbdf9dd86148238c640a

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