Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b81e4997c538571…

MALICIOUS

PDF

75.3 KB Created: 2021-05-15 21:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59bdf46f3d7afc1ad14f0130a5c219d2 SHA-1: eea413383ed1927503a72e759c9c8f1445b15fbe SHA-256: 6b81e4997c538571b68927c4c7c1d22f3f0e1e6b98895ac7e66f42446954c31a
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The presence of a 'graco pack b play set up' lure suggests a deceptive intent, likely to trick users into clicking malicious links. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it functions as a link farm for phishing or scam operations.

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://seumenha.ru/strik?utm_term=graco+pack+b+play+set+up
    • https://gopogaxewose.weebly.com/uploads/1/3/4/0/134013169/da6504.pdf
    • https://cdn-cms.f-static.net/uploads/4480905/normal_5fd3cb353e4f8.pdf
    • http://ogranicbio.space/assistant_extra_light_fontamc8u.pdf
    • http://kartaidatodemeleri.com/64213573323fanzn.pdf
    • https://kabokikofonesa.weebly.com/uploads/1/3/1/6/131637300/jemikon.pdf
    • https://cdn-cms.f-static.net/uploads/4426697/normal_604010d63c9c1.pdf
    • https://cdn-cms.f-static.net/uploads/4379217/normal_6036650e37d63.pdf
    • https://static.s123-cdn-static.com/uploads/4487663/normal_5fc79cab65861.pdf
    • http://hdsamara.ru/54565249904152ov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b4c41f7a-da2d-473e-8a38-526998c5b19c/16147126697.pdf
    • https://uploads.strikinglycdn.com/files/19f55ca8-fe7e-45b5-a7b1-7f8b14547af5/glencoe_chemistry_matter_and_change_chapter_3.pdf
    • https://uploads.strikinglycdn.com/files/acbd356c-159f-4d65-ae69-a45d16d5a867/dekisadufefisuke.pdf
    • https://s3.amazonaws.com/nevowimo/legag.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dace.bin
d8a05dc3bd8795d571874d009877ae324dfa5b3640f7127c9b5dc0c5a80a136d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 4992 bytes
font_01_sfnt_off0000ebec.bin
343cec8be76751a1c122b7827572c09541d1359cb4e1c25040bc8cc0cba9a9d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 10964 bytes
font_02_sfnt_off0001113b.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 4324 bytes

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