Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf5cc35d8a81bfe…

MALICIOUS

PDF

70.0 KB Created: 2021-02-21 04:36:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6018f819163c0b9e6518894779185368 SHA-1: 4865912f09e83018be9a1f93c3041cdd55fd69c1 SHA-256: 3cf5cc35d8a81bfe38e46098d03ea06f82380549dbe1c03d71135b5aebff0f9f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/strik?utm_term=how+to+become+a+ford+certified+technician PDF link annotation
    • https://cdn.sqhk.co/bulunazi/4hjq9hj/gosaduzonerizowotidifoban.pdfIn PDF document text
    • https://cdn.sqhk.co/nazujovo/h86jchf/terry_bozzio_drum_kit_setup_time_lapse.pdfIn PDF document text
    • http://dreamingdeveloper.com/38883026355220v5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461766/normal_6023caa12e1d9.pdfIn PDF document text
    • https://wuzinetasinozud.weebly.com/uploads/1/3/1/6/131606123/3909760.pdfIn PDF document text
    • https://cdn.sqhk.co/naxusepimosa/gijjdpr/tovilukotafezeta.pdfIn PDF document text
    • http://philonio.online/keystrokes_mod_v4fcxzs.pdfIn PDF document text
    • https://gewasulupav.weebly.com/uploads/1/3/0/7/130740056/kosuvasofigo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470038/normal_5fc996bc2d253.pdfIn PDF document text
    • http://nat-yoga.space/naxafipisorerunuzawofenognams5.pdfIn PDF document text
    • https://tusatetop.weebly.com/uploads/1/3/1/4/131408029/xovujowejimune.pdfIn PDF document text
    • http://4gusevshop.website/zagewujitggew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_600e634f54280.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fubolorira.epizy.com/sig_sauer_p229_owb_kydex_holster.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/allegiant_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/tesco_car_insurance_documents.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_off0000d47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47E 5244 bytes
SHA-256: 1d11faedce60bafcb0d4ca57e3d97c963d166ab144d6883b5b4b308988d9e5d1
font_01_sfnt_off0000e637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 10884 bytes
SHA-256: cf8e3b0588274285a73582074dacf39b464289fcbbf55fd1068f6f99ef1c3001

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