Malicious PDF — malware analysis report

Static analysis result for SHA-256 286fd9e5440c4819…

MALICIOUS

PDF

71.1 KB Created: 2021-02-22 00:26:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 71a5bb1883e41d36a2b96b0cddfc49c8 SHA-1: 572d66f8f66c27b68d3ecb7308e22f4443d3546e SHA-256: 286fd9e5440c481976d3e909acdf410a4753c71d768c9c1cf02386f1adcd71b9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains associated with SEO link farms and potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating an attempt to drive traffic to a network of sites. While no scripts were extracted, the presence of embedded URLs and the ML classifier's strong indication of maliciousness suggest this document is part of a phishing or spam campaign.

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://leonvi.ru/wix?keyword=nervous+tissues+in+the+respiratory+system PDF link annotation
    • http://snail-case.store/15637809323623pp.pdfIn PDF document text
    • http://idealica-ufficiale.site/hotstar_app_for_keypad_mobileka5jz.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/hchepCT/nezoxuloberavonagoweruw.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/hiibijA/degar.pdfIn PDF document text
    • https://cdn.sqhk.co/robimovule/vTOlOhg/84680053809.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/2795520.pdfIn PDF document text
    • http://copyright-rules-help.com/bifajasisupegstltw.pdfIn PDF document text
    • http://umkatrade.ru/ark_gewicht_erhhenk8f3z.pdfIn PDF document text
    • https://cdn.sqhk.co/fepogosu/jbieHFw/angry_birds_pop_bubble_shooter_play_online.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/midaguvimabof/illamasqua_foundation_colour_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/guidelines_for_diagnosing_hypertension.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/avg_driver_updater_with_crack_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/duguj.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/venimusugomakiguzavifade.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_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 5160 bytes
SHA-256: 41994b2523921e32169d86ceb6078eab2645574c93d0b5a0d226a72bd2ed8906
font_01_sfnt_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 10080 bytes
SHA-256: 69eabd14963f7e9b36e34beb91cfdb55c13307a1c830b5dd3e80f09607585ddc

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