Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6843bb7f16a8abb…

MALICIOUS

PDF

81.1 KB Created: 2021-05-29 23:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 44a3af7bb04dea0a20f3947693fadfb2 SHA-1: 21ba8990fbe676e74b50aec815f982f1798d048f SHA-256: c6843bb7f16a8abbf042b21d53a744e2762a1f99089535e0e2b3eaf61235263b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO manipulation or distributing further malicious content. Heuristics indicate a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/strik?utm_term=best+extract+from+to+kill+a+mockingbird PDF link annotation
    • https://naweviwezufas.weebly.com/uploads/1/3/1/8/131856142/e2c69d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_602fa1dc85ce6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473432/normal_600fca879b8c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_604713d9e4dc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407316/normal_5ff05b538a64d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393370/normal_600bcacb89fe1.pdfIn PDF document text
    • https://wexipemeb.weebly.com/uploads/1/3/4/8/134860193/9637302.pdfIn PDF document text
    • https://vulajavup.weebly.com/uploads/1/3/4/6/134683256/bivibof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_5fdb2e328c088.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413007/normal_5ff75f26a6381.pdfIn PDF document text
    • https://gufogejerujog.weebly.com/uploads/1/3/1/4/131406717/zuwawidoboze.pdfIn PDF document text
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/134993.pdfIn PDF document text
    • https://vejiledulibona.weebly.com/uploads/1/3/4/3/134318828/xamukesagalivozigew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_60178d84196e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379237/normal_60270c2563f43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372080/normal_6039bc556e16b.pdfIn PDF document text
    • https://jukatuve.weebly.com/uploads/1/3/2/7/132741058/3238872.pdfIn PDF document text
    • https://devogenigibef.weebly.com/uploads/1/3/4/5/134501446/nikurupivaredavud.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/0ef487ca-0065-46ea-b703-b6a330085d7e/72010730686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c7f10c5-9d5a-4413-954f-6ac96e63c7a3/87798951149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b11fd8-ca02-4f5d-91c9-044d5d99cd05/genie_pmx500ic_b_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8821569c-a59a-4de8-81d0-8d1e37206bf1/sedugofupidejisupudij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e389d307-4084-40bb-bb46-b38c545af60b/schwinn_recumbent_bike_230.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_off0000fe98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 5664 bytes
SHA-256: b3c5e11ea72ab385870dc2d65c798013378bc3648286d300bb76889d393195fe
font_01_sfnt_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 10980 bytes
SHA-256: ecbf8031170efb1713b68dfd0640c91861bfc86cc5a7e15c64551eceb1eb6768