Malicious PDF — malware analysis report

Static analysis result for SHA-256 94199bc38b56e30e…

MALICIOUS

PDF

94.7 KB Created: 2021-03-25 14:59:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 31a0667bcb80adac6204e6269a9c2c75 SHA-1: 7a9088f9db7727ad9690c4248cab6b8c8a9599b3 SHA-256: 94199bc38b56e30e1ba42b1f744c69b286237929ab26dfab4a8fab1b7a0a597f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and embedded URI heuristics suggest it's designed to redirect users to malicious or deceptive content.

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://kuzutuzo.ru/wix?keyword=ysgramor%2527s+tomb+map PDF link annotation
    • https://xemizumelisiga.weebly.com/uploads/1/3/1/8/131856695/c14f2b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452392/normal_5ff9c94515815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465390/normal_603205006f974.pdfIn PDF document text
    • https://tisawotaw.weebly.com/uploads/1/3/5/9/135993845/3305720.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379240/normal_5fe3bc7515c21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448121/normal_5fd12959462cc.pdfIn PDF document text
    • http://ericksandoval.com/58543724934zynzd.pdfIn PDF document text
    • http://coolstudent.space/sojurrlq2n.pdfIn PDF document text
    • http://premiumpornclips.com/zutatokoxuganilwxl06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_602d83451ca06.pdfIn PDF document text
    • https://kibajalixil.weebly.com/uploads/1/3/0/7/130739780/6303228e20.pdfIn PDF document text
    • https://kaxozugusejerob.weebly.com/uploads/1/3/1/4/131452826/162336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382770/normal_6045e53190370.pdfIn PDF document text
    • https://bivedaniliged.weebly.com/uploads/1/3/4/7/134732971/sozemelitin-ripaxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451205/normal_5fe47fc34da37.pdfIn PDF document text
    • https://latuxuxapeja.weebly.com/uploads/1/3/0/7/130739017/gatudovanibemi.pdfIn PDF document text
    • http://robinmani.site/teduteteryvuis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_85967145af6c43afa6be549d2d0b3aa2.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_1228cda2d4bc4f14b45e63af4514443e.pdf?index=trueIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_0ad653142baf42df94177eb1f670e79a.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_off000131bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BF 5244 bytes
SHA-256: 51400603c5185343f8d9119e03b488d7da6eaf8fcf4c3f780083f11aef45cfa1
font_01_sfnt_off00014387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14387 12800 bytes
SHA-256: d925ce217ffb9d955302fe89c557b18ad9b7309aa1ce9195032aa4c305a9c453