Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ab9ad175c30433…

MALICIOUS

PDF

79.5 KB Created: 2021-03-17 22:01:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c58329a18dedfece00071d9e0327fe01 SHA-1: b7bfec9e85ee039ef3981cf467b9c84230a3ed26 SHA-256: b0ab9ad175c30433151882f4d97060a8906fa9be4deb41009d87252d153c5f06
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a primary lure pointing to 'free loft bed plans' via an SEO redirector. This pattern is indicative of a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to drive traffic to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gimoguvi.ru/award?keyword=free+loft+bed+plans+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410462/normal_601bf9b747f95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_6041410dd7eeb.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/gIuq84w/royal_oak_archers.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/Th65Xie/planet_of_the_apes_caesar_son.pdfIn PDF document text
    • https://wakezibi.weebly.com/uploads/1/3/4/6/134695128/9b2b2301313.pdfIn PDF document text
    • https://pilidikuvitas.weebly.com/uploads/1/3/4/7/134766888/tobedijovuvewum.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/gofilafixu/battleground_survival_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/mac_pro_2019_spec_sheet.pdfIn PDF document text
    • http://xidazita.epizy.com/vijipepidezilizuvaw.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/vamore.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/nifaduz.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/computer_hardware_maintenance_schedule_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/cisco_ccna_exam_flash_cards_practice_library_640-607.pdfIn PDF document text
    • http://gizogebinide.rf.gd/96993208119.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_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 5132 bytes
SHA-256: 75da7c7f169be479d8c086bea11ff7922418a23cb7af4b0e4faf8625bca6e11c
font_01_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 12560 bytes
SHA-256: cd60c1a1fd9870ccea76687b70cd01b8e7b5e910cdd9d8aaccc8e834690cc811

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