Malicious PDF — malware analysis report

Static analysis result for SHA-256 c276d106c0fb89c7…

MALICIOUS

PDF

91.4 KB Created: 2021-04-02 16:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ea424b465995cd97862cfdac596936ff SHA-1: 21f84ed911595df532dc951e83431246127cb6e7 SHA-256: c276d106c0fb89c7e575ab9857c45f0c1a8394bfd2e11ea98675c573826cf382
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'SE_CALLBACK_LURE' indicates the document may be designed to trick users into calling a fraudulent support number. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to malicious sites or initiate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bologen.ru/strik?utm_term=wacker+bs60-2+parts+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427538/normal_603edd8d3b63d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496853/normal_602072a82038f.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/wezekirufidizox.pdfIn PDF document text
    • https://bigeriburaline.weebly.com/uploads/1/3/4/3/134334921/1819842.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453335/normal_601c058a3baf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466680/normal_60470a7d04050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454286/normal_6015d57a166d9.pdfIn PDF document text
    • https://renezotutumiw.weebly.com/uploads/1/3/5/3/135343322/b625833feb41.pdfIn PDF document text
    • https://torewofatovamek.weebly.com/uploads/1/3/4/1/134108613/kusikexop-timegubigub.pdfIn PDF document text
    • https://vakitisize.weebly.com/uploads/1/3/4/0/134017930/lugixufi_somuxiborewusib_zinopin_tanuwijagor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417528/normal_5fca96d407419.pdfIn PDF document text
    • https://gufakapefevem.weebly.com/uploads/1/3/5/9/135994046/6828304.pdfIn PDF document text
    • https://pudakivofuleges.weebly.com/uploads/1/3/4/8/134853743/nupikulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402486/normal_5fd958feb261d.pdfIn PDF document text
    • https://jeboxalu.weebly.com/uploads/1/3/0/9/130969965/d13717464fc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_606188f2b23c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/210d5747-017c-4c2a-8d7b-39be84be2662/lusopokitapivefus.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/28875460517.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/wewijowilujoderunowux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a87937-d42b-4290-8fda-a9396a98c089/ravurinepan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/490a1339-3bcc-4a93-9c20-c11c2ce05999/buvixunerofubewenano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7527c02d-1afb-4982-a76b-be6ba5ee075f/sadovubinesizikonizimema.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/transformers_bumblebee_movie_toys_energon_igniters_nitro.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E2 4916 bytes
SHA-256: 952e188f24198fba3900fe5cf615fae76a2f8147ddad060ffaaec6860e065e5e
font_01_sfnt_off000126c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 5756 bytes
SHA-256: 668d305144e58b965844ffe059a5577b04b90cd232f6f439c5ea1baa43c61b22
font_02_sfnt_off00013a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A61 10936 bytes
SHA-256: c68653fd50f5adab918843bbcd4836b43dd968c216ca679d406d58e4c2558999