Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a17d7079d36417b…

MALICIOUS

PDF

60.5 KB Created: 2021-02-01 18:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3fea2546c895b08c412851cefdb232e7 SHA-1: 7a1ff13b1c322a5e2f1fcc577e123ef4d3d2970d SHA-256: 3a17d7079d36417b8788548698f5affcd58d4bb436c6499ccdf5aa560ff8ac4c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one heuristic specifically identifying a 'PDF SEO LINK FARM' containing 28 links, suggesting an attempt to redirect users to potentially harmful sites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/123?utm_term=asa+softball+foul+ball+rules PDF link annotation
    • http://fullhp.info/aashto_lrfd_bridge_design_specifications_8th_edition970kk.pdfIn PDF document text
    • https://vibakifekapob.weebly.com/uploads/1/3/1/3/131398015/jojilagudonewowabixe.pdfIn PDF document text
    • http://dimax-matrasy.ru/kukedabaju02ye4.pdfIn PDF document text
    • http://ebay-coupon.ru/35146460002os9r5.pdfIn PDF document text
    • https://godivibodo.weebly.com/uploads/1/3/4/0/134040440/5105658.pdfIn PDF document text
    • https://zufogeseganoxe.weebly.com/uploads/1/3/0/7/130776657/2656023.pdfIn PDF document text
    • https://guvujuxedudekef.weebly.com/uploads/1/3/1/1/131164066/1410612.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kaxasasetepub.epizy.com/qualitative_characteristics_of_financial_information_iasb.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/geddes_sd_fishing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/24807758921.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/bottle_mockups_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/14880661190.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/best_answer_of_what_are_your_strength.pdfIn PDF document text
    • http://warufadul.rf.gd/30273210049.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_off0000b2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D0 4892 bytes
SHA-256: e87db439f5f1040c54c9cb73682329623a014a9f460b65d1ccebad9b4f81824c
font_01_sfnt_off0000c37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37F 9964 bytes
SHA-256: dec2f4185815f69625a59da8d91d1eab293f6906c62a9902ecf584e789e80292

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