Malicious PDF — malware analysis report

Static analysis result for SHA-256 952db5d46ce100ee…

MALICIOUS

PDF

76.9 KB Created: 2021-04-25 21:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 541ff1f89ec2b0e7e8a8353f9578b4fa SHA-1: cd3279cd651344775cb7b6c22dc42178ee2168d0 SHA-256: 952db5d46ce100ee60954108839af8f5e2e2d88e533076d38e394ecdb2205a4e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though truncated and obfuscated, suggests a lure related to a product manual. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

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
  • 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 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=alpine+mrv-f357+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4459796/normal_60172b1b7b8b3.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/1Iribjb/daddy_long_legs_game_horse.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/gUvjfWr/cute_to_do_list_template_word.pdfIn PDF document text
    • http://zuluwana.iblogger.org/wexisosizabimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407998/normal_606c6b9a1eb1f.pdfIn PDF document text
    • https://cdn.sqhk.co/metajewamiva/jcJJhjl/top_tracks_of_all_time_spotify.pdfIn PDF document text
    • http://maletewidulebil.iblogger.org/ketamage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497658/normal_602d1c9a27def.pdfIn PDF document text
    • https://cdn.sqhk.co/xumupojamax/iihaif5/math_flashcards_for_ipad.pdfIn PDF document text
    • http://topsalon.xyz/kedurimupukufivqyfm2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475582/normal_6049e9e627b1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463551/normal_6019f09b23513.pdfIn PDF document text
    • http://lg-copyright.com/16222572715lvxde.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/i2biegg/double_dragon_trilogy_pc_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_5fd0f63059527.pdfIn PDF document text
    • https://cdn.sqhk.co/fezusife/wbhjRtj/acrylic_nail_designs_blue_glitter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417670/normal_5fd8ceedeaf1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_5fd7cc3cb19ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesivigodexewig.epizy.com/australian_visa_form_from_pakistan.pdfIn PDF document text
    • http://fudapigoxuwumu.rf.gd/girajavarulekamimil.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_off0000ed1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 5316 bytes
SHA-256: cce378b66a6533c63f85306adf9a72361696356317104234da9d92d8820b3362
font_01_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 13076 bytes
SHA-256: 46b27cc101632b28e38ae49925df09a005e21bba70122ab186294da0e1f4cc93

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