Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89dea52111ba8cd…

MALICIOUS

PDF

84.5 KB Created: 2021-04-04 19:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b4ff6bb8aa0b150e78e8823f3662c6cb SHA-1: 2752f7aee4aadfe987d1de3c2772deb3b37c6956 SHA-256: e89dea52111ba8cd0e2461ba66fbc4f92641a5961bd158e0b79458d5c5ec03a5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The embedded content, though heavily obfuscated, suggests a lure related to 'best cuddeback trail camera', indicating a potential SEO spam or phishing campaign. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/strik?utm_term=best+cuddeback+trail+camera PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446638/normal_6058a9a7b9fb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_60301a9b4ec22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_602704f1f207e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422879/normal_605425335599a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_5feaecd39ab18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473359/normal_5fd63464b3ee8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368964/normal_5ff3fd86b71f6.pdfIn PDF document text
    • https://xetakafiso.weebly.com/uploads/1/3/1/8/131856826/0f2629c97.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/pileze_kosaxagixon.pdfIn PDF document text
    • https://munipepuxorikoz.weebly.com/uploads/1/3/0/9/130969311/4274467.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5fd05d87000e8.pdfIn PDF document text
    • https://duvigefotazepex.weebly.com/uploads/1/3/0/7/130775674/7660700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_6047b5fdbecff.pdfIn PDF document text
    • https://bupuvebawa.weebly.com/uploads/1/3/2/7/132740405/ae5a3d2b07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/98517714669.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_2d72ad7c85de48cc89a1489adc205e8d.pdf?index=trueIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_3b0d7231637f4b418c41682167af8e09.pdf?index=trueIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_d3a3fe1a9ffd4cdc8850160acee93c4e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donarepemi/similar_shapes_test.pdfIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_7f28b008c285488c878d760ee8c9dbec.pdf?index=trueIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_fb0c010b31a9413687a0b9cc05c0ded3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/45087215759.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/72547262457.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_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 5004 bytes
SHA-256: d8f1bbb6b68be60adf39cc2a3dfaff49d0092ca5ff29c3e99e3b273f56ab3a03
font_01_sfnt_off00010e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E01 11496 bytes
SHA-256: 0f3455a7fce71e411f0c30dc03a8a105eca4aacc0d1b02c176674d3d3692c0da
font_02_sfnt_off000134e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E5 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361