Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c202fee6c458be…

MALICIOUS

PDF

74.3 KB Created: 2021-06-10 19:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 242b5968fec9374c1f252e4b857bc19c SHA-1: aa54d9f91261c6befa2f39b99a854c29534727fb SHA-256: 85c202fee6c458be66f84713a168845333a712939e35d1faec2be79dc85c9879
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chcial.ru/pbw?utm_term=tmnt+gba+2007 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404723/normal_5ffb56484de07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417999/normal_606a0f65c3e50.pdfIn PDF document text
    • https://susutabum.weebly.com/uploads/1/3/4/4/134464128/6270e5a4d3dbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5fd3821796b6a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4456116/normal_60b0047b98103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389582/normal_606e7e199d63d.pdfIn PDF document text
    • https://japapitamamevoj.weebly.com/uploads/1/3/2/7/132740309/e4c45df48c93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_606b942d7cb18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5ff94684db685.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464861/normal_5ffc256a2cb55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466143/normal_6064f4d1ac36a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476446/normal_5fe82ff6c991d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467318/normal_5ff1af47710ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412378/normal_60207a619cbd7.pdfIn PDF document text
    • https://jugoneworo.weebly.com/uploads/1/3/4/3/134307205/pekesiko_balamadodoxezo_zixidujoto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368982/normal_5fccee8fb7222.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/34802ef5-dced-47c3-a73a-a9ea4d280945/zanatalakuburofapu.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144977382/28277154076.pdfIn PDF document text
    • http://kufugaref.pbworks.com/w/file/fetch/145026270/85926961333.pdfIn PDF document text
    • http://kizisoj.pbworks.com/w/file/fetch/144520716/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c07fbc00-b601-450d-b8d2-12d111bcca97/is_the_movie_beautiful_boy_based_on_a_true_story.pdfIn PDF document text
    • http://zufumegi.pbworks.com/w/file/fetch/144422691/how_long_do_you_cook_frozen_lasagna_in_a_convection_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1bd1760-f215-488e-93d9-64fcc7ec5e4c/atomic_physics_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b2fef50-4c40-490f-bb2a-12000edd4846/porefoloxafiligodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe1325fd-3964-4c2f-bc03-d0c7f540f71a/recaro_performance_sport_harness_booster_car_seat_-_knight.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/w/file/fetch/144756651/65712501052.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_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 5140 bytes
SHA-256: b39cf60494acb230b429026c1841519a8978abe8e0bad02103bbf18b6701b3ce
font_01_sfnt_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 12004 bytes
SHA-256: 71acfb8f427c63f3101802d84316f16c0100ae29027ec89d67c4040d1a44a725

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