Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ae395911df76ae…

MALICIOUS

PDF

84.2 KB Created: 2021-05-10 18:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 27c74f22c10ebbda6ffa9b89ec874af5 SHA-1: 2a7e1eb04f3cd7dea410ce22e6a410470e6d1f4c SHA-256: f1ae395911df76aea78b0f8e07ad70bca02dbf3f87232cc5de312432f60b7a12
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9997

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/strik?utm_term=can+you+get+a+covid+test+in+nc+without+symptoms PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420586/normal_601fad41191e0.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/wefodobizorizibat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_601ac4ce5120b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481667/normal_5fc7b882dc791.pdfIn PDF document text
    • http://kigadotezolesun.mypressonline.com/misisitosanereseg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401546/normal_6062d60bed9ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415756/normal_60648efe56b0d.pdfIn PDF document text
    • http://gerujidubona.iblogger.org/learn_english_to_german_language.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446027/normal_6054061f7b05f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_602859d929ff5.pdfIn PDF document text
    • http://pililiriniru.mypressonline.com/jowexiwir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_605f8208480fd.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/18f4bf91-8cc1-48d1-b2ba-f4f037f99ea7/safibumomapozidok.pdfIn PDF document text
    • http://dafuwinev.myartsonline.com/namaz_ka_tarika_in_urdu.pdfIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_a68484b8083847ce9c5022e1c2559f53.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9692d75-a106-456f-bd42-44fbc1075d5d/70322619519.pdfIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_3c724af4265741548b5c34bf3dd17c2b.pdf?index=trueIn PDF document text
    • http://vigexosav.myartsonline.com/because_internet.pdfIn PDF document text
    • http://vemusimovoxodan.rf.gd/hamilton_beach_coffee_maker_error_code_e07.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f309abfc-cf17-4065-883b-61e713c3e90a/gracie_jiu_jitsu_white_belt_curriculum.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_7b2d0e9122d1497d9ca7fa7272ad115e.pdf?index=trueIn PDF document text
    • http://guzumirofega.epizy.com/75826996914.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_off00010987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10987 5520 bytes
SHA-256: 9f5d25f58f816cde03edf6263fd59ea9ffc0a41b3be26c62c09e3a92297d3f5b
font_01_sfnt_off00011c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C45 11440 bytes
SHA-256: 9865e67a5ef6458bb9f4e8a46cdbfd8028e50598021e2c558d1e03ac2a47100f