Malicious PDF — malware analysis report

Static analysis result for SHA-256 58db028abb80565c…

MALICIOUS

PDF

68.0 KB Created: 2021-03-05 00:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5665ca19515fd374872a19b68c6637af SHA-1: 3464188dfd5fbe0b0706dc4ef1c89a34786bc798 SHA-256: 58db028abb80565cddc8b49fbc1e0173a06df5de903d9f3138e34dcce0c3ba19
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it may be used to redirect users to malicious sites or download further payloads, aligning with phishing or malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://golowaki.ru/wix?keyword=glencoe+precalculus+pdf+answers PDF link annotation
    • https://vifojozajo.weebly.com/uploads/1/3/1/4/131454549/af94630.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/Oidhahj/gafewuxedemub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_600ef223734cd.pdfIn PDF document text
    • http://rawitotizoxuk.scienceontheweb.net/xuzorosikifiwuz.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/should_i_go_to_disney_world_in_january.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467945/normal_5fe3b5d9ca33f.pdfIn PDF document text
    • https://cdn.sqhk.co/valipovu/jatyia3/42314481758.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/xidgfhb/rolly_legs_apk_android_oyun_club.pdfIn PDF document text
    • https://nizedavigo.weebly.com/uploads/1/3/4/8/134879015/forejemunabojaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447097/normal_5fdcdff51c042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_60181b236d6ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494673/normal_5ff8fb872a75f.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/knight_physics_for_scientists_and_engineers_4th_edition_solutions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467577/normal_601d4ef5cd796.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420917/normal_60047cca0eee2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413718/normal_602c48cf4ef3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_4eeeeeec2f714b7ca108b45279020462.pdf?index=trueIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_2f761fd67f174b74bbc87b8ce082412a.pdf?index=trueIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_9fbb3e0fe02c434dae1dcb0e194ba10b.pdf?index=trueIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_53df42e661b043fb84730cb7bb1d28b4.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_f2af7e44b51342228b9cbff12fac565f.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_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 5272 bytes
SHA-256: 354c9f1437e235aa1ce7ee67e84a700da1646b03fbce5fd23c2589c2946253a7
font_01_sfnt_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 9800 bytes
SHA-256: 01f48b283588f02eaf58b3de035798a9686026635d45de40172696e706f62e5f