Malicious PDF — malware analysis report

Static analysis result for SHA-256 b545b87427f319f5…

MALICIOUS

PDF

84.0 KB Created: 2021-01-10 03:16:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b8444245fbcc4d39fd79069919b7ce69 SHA-1: d035a7f71ef3d480c6fcdfd24e31c6c0e408df4a SHA-256: b545b87427f319f53f5d41a365432e63dc93301cdb354662d3de58fe80dc188a
186 Risk Score

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 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
  • 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.
  • 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://traffine.ru/aws?utm_term=ashrae+comfort+guidelines PDF link annotation
    • https://devuxitimon.weebly.com/uploads/1/3/4/5/134596282/mavuduwijewu_femujofef_sivanewotisil_zabusalokavovo.pdfIn PDF document text
    • https://notupazepikinis.weebly.com/uploads/1/3/4/3/134382888/pamujubo-pewibetoved-wibopojix.pdfIn PDF document text
    • https://cdn.sqhk.co/nunemiziku/hfjg3Ra/commander_collection_green_spoilers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383156/normal_5ff262a179a29.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/nasavupu.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/4fde20248697d78.pdfIn PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/7090038.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/Rjbijhb/survive_the_infection_roblox_mini_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454822/normal_5fbbc303411a6.pdfIn PDF document text
    • https://puwofevu.weebly.com/uploads/1/3/4/8/134862481/dusufopuroxoton_komudazukilu_nivaxuva_wubejedosisaba.pdfIn PDF document text
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/c1c0039a871bf.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvomafoda/1hiijd5/mirtazapine_interactions_with_other_drugs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 5424 bytes
SHA-256: fa3af70ad9847af75ed302859a3cd661e2d31a0ed737b73f01ceff2ae70dad0f
font_01_sfnt_off00011cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFF 11092 bytes
SHA-256: 3c2953311cdeb2c87a1f26e301053aaa5a4c3a4d37da848b3649bbba18a3e696