Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea6a4757084e02c…

MALICIOUS

PDF

77.0 KB Created: 2021-03-28 07:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b3cc5c46c0f42f1cd3ccaa52488935bf SHA-1: 8c061ec4ae365b48f9bdfe785e517101605df882 SHA-256: 0ea6a4757084e02c8843d30c0be2ffd43e2af36cccede9900a826fd4da1bca98
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/award?keyword=anesthesia+pharmacology+pdf PDF link annotation
    • https://pubotaxo.weebly.com/uploads/1/3/5/9/135962756/kazusatibedade.pdfIn PDF document text
    • http://freehookup.xyz/mean_median_mode_variance_and_standard_deviationsd2yq.pdfIn PDF document text
    • http://osmosiotzs.fun/23275834533kqooe.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://semuzotefol.weebly.com/uploads/1/3/1/4/131437619/278b3d60d3.pdfIn PDF document text
    • http://firstdoctor.xyz/mksap_17_downloadpuqf4.pdfIn PDF document text
    • http://sehq.xyz/what_is_social_practice_artmiswm.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/34128769383.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/bakazo_garavulemikab_lifemufeka.pdfIn PDF document text
    • http://zokugorevat.mywebcommunity.org/mechanical_engineering_colleges_in_new_york_city.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/libusamagowuvo/sevotavepiji.pdfIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_46367ae8cb9f478abd21b636ef7f6859.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/bavudoreka.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/pentax_k3_mark_iii.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_8721164f2c8042ff80ea5f6b15d122a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/turip/beretta_apx_combat_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/midamedodizedogagugu.pdfIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_4b4692da51c84b4480feb1fa3d919044.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/boxman_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/lojebefazu.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_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 5660 bytes
SHA-256: aaccc1525beaeaadfc6a4d84c596d31d9030dec7868ac3f7b28c4dd1c9766c99
font_01_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 11476 bytes
SHA-256: 56feb6bd6b0557798d73a50cc99fe009893ee20ff6af13a7bb738b2b531038a2

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