Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c498cc07dd01f6…

MALICIOUS

PDF

74.9 KB Created: 2021-04-14 13:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5a78f8dd228b3bfcf1408f7e55e51160 SHA-1: 5afe79fa3ea0f69735dab061ec04232e8a45b6b0 SHA-256: 58c498cc07dd01f6424987547a5142dff25277de2f50df9b50d869f843407d2d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded URLs. No scripts were extracted, but the extensive link farm points to a coordinated effort to drive traffic to malicious sites.

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://lozipotod.ru/strik?utm_term=dreams+about+snakes+shedding+their+skin PDF link annotation
    • https://cdn.sqhk.co/sazobenapur/6ghdhco/41189283598.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416299/normal_6006671439723.pdfIn PDF document text
    • https://boziwukajolefix.weebly.com/uploads/1/3/2/7/132711983/melapumipa_bopafom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451350/normal_60506a91b2e2f.pdfIn PDF document text
    • https://vetebifarex.weebly.com/uploads/1/3/4/0/134016991/tamikemijufubenosu.pdfIn PDF document text
    • https://lifoluzasodani.weebly.com/uploads/1/3/1/4/131437418/a3789974c6.pdfIn PDF document text
    • https://betivaronapan.weebly.com/uploads/1/3/5/3/135350750/sefisuronex_tiwesexu_devofomivafulis_totofejigowulup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455681/normal_60673da3835df.pdfIn PDF document text
    • https://fibexijenoka.weebly.com/uploads/1/3/2/6/132680926/6456107.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/PqibJli/slice_dice_chop.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/luramamelolem/lutte_contre_boko_haram_au_cameroun.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/70202096109.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/element_compound_mixture_worksheet_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/jowenimepurinosekoxebuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/58632648637.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/96959131302.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/the_adventures_of_sherlock_holmes_book_report.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_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 5408 bytes
SHA-256: 5b9de5850f56c1f5eb679da40b52459874bd2df932258cd1d16a00128bb48ed3
font_01_sfnt_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 10552 bytes
SHA-256: 6fe30f5719e4af6767c14fcfae5f860d73b23e3e10e54d41a01c104ba3005732

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