Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c836b682d79da4…

MALICIOUS

PDF

116.7 KB Created: 2021-05-28 21:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3cddc28b4ff2974112c0a3873298f30a SHA-1: 96b554343a4a5cd691bc5f00c98f0a8d3b4194bd SHA-256: e9c836b682d79da41acb2040c1e9a2228e21c4189754ac88b72418581b0a0fae
146 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. 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 0.9996

Heuristics 6

  • 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://mezovuduw.ru/strik?utm_term=schumacher+se-5212a-ca+manual PDF link annotation
    • https://kijagixizob.weebly.com/uploads/1/3/3/9/133997709/4631309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450734/normal_5fd86e7cb8647.pdfIn PDF document text
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/095441cb21c0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379848/normal_6000f12f1ad21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402486/normal_602b0c86637d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414871/normal_5fe4a6b36a0bd.pdfIn PDF document text
    • https://bovefunovowuto.weebly.com/uploads/1/3/0/8/130873908/9232611e925776.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495042/normal_5fdec68e6216f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5fe6e16b3134d.pdfIn PDF document text
    • https://morozosewiveloz.weebly.com/uploads/1/3/4/3/134387595/6036721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464532/normal_602656a65325d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470698/normal_6044956d538a6.pdfIn PDF document text
    • https://sazotavivi.weebly.com/uploads/1/3/1/1/131164406/lodaguwokeju.pdfIn PDF document text
    • https://mirujodafepofon.weebly.com/uploads/1/3/4/7/134707115/wereriroz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494165/normal_605578261c599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473947/normal_605c06c49554c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410000/normal_605d48aaed17d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_5fe78884755fb.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/06664ffa-632d-4900-b9d7-ba5adce86f6c/tavakuritesugosaxodol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/035f9f08-7585-4a6c-8f8e-a570565be9c8/winafekid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3256a34-c51b-4aa3-87a7-f0ef61e8874c/what_are_the_best_network_security_certifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/470e8e9b-8444-4d37-9a86-a0d7bd3155bb/31736857446.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18915 5480 bytes
SHA-256: e0b2a9af2868864eff9f39a640361dd23bde140bd82c9cfc87440ae25f8d462e
font_01_sfnt_off00019b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B9A 12976 bytes
SHA-256: 65369b83f388d0d4998fff8b81dc5ad60b6bdb7ec9a31430fecb21d7784e9014