Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98dd437fef41459…

MALICIOUS

PDF

80.2 KB Created: 2021-02-13 06:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7d1d29ac5740e21c5809d5650331bdd4 SHA-1: 1bec37b909b813e7abeead26a753486b2edeb51b SHA-256: f98dd437fef414595dbb96d44df71ad695a5f723e3d1e0bb3704b7dfb1bfd24c
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to potentially malicious domains, indicating a link farm or SEO abuse tactic. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to redirect users to harmful content.

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://maypoin.ru/123?utm_term=separating+a+mixture+of+elements+and+compounds+lab PDF link annotation
    • http://salonhq.xyz/feeding_guidelines_for_3_month_oldby8c1.pdfIn PDF document text
    • https://kobuzonoge.weebly.com/uploads/1/3/1/4/131452837/boduwatadofetarirut.pdfIn PDF document text
    • http://prizinsta24.online/wekaniftla0b.pdfIn PDF document text
    • http://zathkatow.xyz/skype_portable_heisen2d45.pdfIn PDF document text
    • http://glawerry.online/cdc_colorectal_cancer_screening_guidelines1o6r1.pdfIn PDF document text
    • http://mosovonetuvu.iblogger.org/netox.pdfIn PDF document text
    • http://ximilakuxulo.iblogger.org/arteriovenous_malformation_in_uterus.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/razikuzxhrh.pdfIn PDF document text
    • http://fullpisetc.ru/mahalia_back_up_planiv85f.pdfIn PDF document text
    • http://sluzhba1.net/gakolujovamhrpvl.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/tedowafomaru/74556998033.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/john_lewis_baby_sleeping_bag_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/lobekerinosufipa.pdfIn PDF document text
    • http://vidabovon.epizy.com/asymmetric_warfare.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/free_sheet_music_hedwig_s_theme_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/gestational_hypertension_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/xejases.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_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 5788 bytes
SHA-256: a9c96bdb8049b4f47642c64610defc8d8aef2a003b662326ee673956560101b8
font_01_sfnt_off00010ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE1 10684 bytes
SHA-256: 00d8b3e4bf78e769ca198f740e2b323f1ce38a2bca3e172ab838c87867ac03a0

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