Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cb44d32a0ec6ce…

MALICIOUS

PDF

68.5 KB Created: 2021-03-23 03:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 263d9c6672a6564745756aee79cdf6f8 SHA-1: e8369642a83afbae418a972ba155a9c43a9504d9 SHA-256: 24cb44d32a0ec6ceaefeded67a1b5b913c2e97df2f2ad76ed9fa082f8220650e
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed for SEO manipulation or malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF's structure and embedded URLs are indicative of a malicious redirection attempt, possibly leading to a phishing page or a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=stihl+025+chainsaw+service+kit In PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/dAtQjhf/kefixiliviwexekabuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/xadelakora/hliehaK/katunaluderemo.pdfIn PDF document text
    • https://dexajaxalujum.weebly.com/uploads/1/3/1/8/131857565/kekemusanisax.pdfIn PDF document text
    • https://cdn.sqhk.co/xurinuwame/6mjiijA/modern_combat_4_zero_hour_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/FjgghX9/55009994322.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/hbgijgc/nurafaza.pdfIn PDF document text
    • https://bifotuvimutojuz.weebly.com/uploads/1/3/0/9/130969437/somop_nunizujubuzizuk_fufadazafaxol_lofume.pdfIn PDF document text
    • http://myirn.icu/kadikinikipovavalatgcjbp.pdfIn PDF document text
    • http://lngcliente.com/sagusapasqj7do.pdfIn PDF document text
    • http://sdek-24.cc/88429071749x31tm.pdfIn PDF document text
    • https://cdn.sqhk.co/nerurepaza/c5ihjck/event_promo_premiere_pro_template_free.pdfIn PDF document text
    • https://cdn.sqhk.co/migazajigum/l9ggMJT/elements_of_interior_design_color.pdfIn PDF document text
    • http://teplotronic.ru/notaribarililsmv4v.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/zenerawixuzagavumeti.pdfIn PDF document text
    • https://nowiwadigomu.weebly.com/uploads/1/3/4/0/134018048/90115927d88a3.pdfIn PDF document text
    • https://cdn.sqhk.co/pekobenew/crjfjg5/stick_squad_sniper_battlegrounds_hack_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://063758de-fb2f-4258-809e-b727485bfd5a.filesusr.com/ugd/89cda4_f83296010fac44cd9e67d932ee766aa8.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_bbac75a9119c4610bfa3bf9947548d9e.pdf?index=trueIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_052d0e5c4bd24e58bed739a761978c11.pdf?index=trueIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_bb30fa78abd1480a80580ae7c0fdc3db.pdf?index=trueIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_9c07591a87ab471c9427f646d8f90a98.pdf?index=trueIn 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_off0000ccfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFC 5604 bytes
SHA-256: 4f6e601dcff8e0773c9a84026ba77658d6c1c31d512d509c0403d8d0e8938a6d
font_01_sfnt_off0000e024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 10824 bytes
SHA-256: 9274699fd9c1462913c53bd88389ac3fdffe6b0b127600934d145cf128209403