Malicious PDF — malware analysis report

Static analysis result for SHA-256 5270673ce9cdcbeb…

MALICIOUS

PDF

69.2 KB Created: 2020-12-08 02:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 48f33b4eab82ed2beeb1651a1810aaf8 SHA-1: 15a25107afb7023bc58f489c5272ac56102b9e3a SHA-256: 5270673ce9cdcbeb692e65b97e48cd20e2e3734e375a83395dc9ff9887ef9b3e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/strik?utm_term=combat+hapkido+manual+pdf PDF link annotation
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/rasawafog_xibamanugaju_mamajazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5f8cfd263aecb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368955/normal_5f89191e681fb.pdfIn PDF document text
    • https://fujamimoxelak.weebly.com/uploads/1/3/4/6/134601663/47bf7c31cccd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477173/normal_5fb48f72460ef.pdfIn PDF document text
    • https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/d1f6d8.pdfIn PDF document text
    • https://nepajomawowezuw.weebly.com/uploads/1/3/4/4/134462508/3453760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493282/normal_5fb7704e9f895.pdfIn PDF document text
    • https://saniwuladekogek.weebly.com/uploads/1/3/4/7/134759819/dotupinob_bonalijuvujutut_xinewedanut_sibalasebozexel.pdfIn PDF document text
    • https://kotidirexi.weebly.com/uploads/1/3/4/3/134358756/4507979.pdfIn PDF document text
    • https://takotifisusa.weebly.com/uploads/1/3/4/4/134499816/ae4184fc15eef03.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://uploads.strikinglycdn.com/files/cdfd8409-df6a-457c-942d-2b9af11f65e0/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35d97bb-c0b4-474c-94ff-ec1920d58086/zujutubexuvasenewajet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd42a9fb-ac5e-42ad-944e-b41ca77e4b03/eureka_math_grade_3_answer_key_module_5.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC90 4996 bytes
SHA-256: 8b69e08d8d12a199d5524dc2dfa4e735453487ee1d0e0d4e8ea1fc9d8bc916dc
font_01_sfnt_off0000bd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD61 9620 bytes
SHA-256: bee91f8b7d301b967e4ee9be76cd49756353d24c488823439bad4e0d0dcec0f1
font_02_sfnt_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 18040 bytes
SHA-256: a031885212fbae1482b18393496c4136bc3a69fd7e301c2c6037e55a4505bb30
font_03_sfnt_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3