Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4dee7918defd39…

MALICIOUS

PDF

83.1 KB Created: 2021-01-21 02:14:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: efd84228a577425d73d706c2a60621a0 SHA-1: 82f12db22fc5b93c53e6867d4fe87925a2c1518e SHA-256: 5c4dee7918defd39c7352c4701a031701f0f344ced52a7c38040981aae6679a1
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, pointing to numerous external URLs. One of these URLs, 'https://bologen.ru/aws?utm_term=pak+army+armoured+corps+uniform', is embedded directly, suggesting a lure for phishing or further exploitation. No scripts were extracted, but the presence of numerous external links points to a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/aws?utm_term=pak+army+armoured+corps+uniform PDF link annotation
    • https://lefiluke.weebly.com/uploads/1/3/4/8/134887161/pigemumobixeb.pdfIn PDF document text
    • https://giximanuv.weebly.com/uploads/1/3/4/5/134526051/4543194.pdfIn PDF document text
    • https://site-1215102.mozfiles.com/files/1215102/car_engine_parts_diagram.pdfIn PDF document text
    • http://fopesekebamit.22web.org/memento_mori_full_movie.pdfIn PDF document text
    • http://jaraxusej.iblogger.org/67324198806.pdfIn PDF document text
    • https://site-1176700.mozfiles.com/files/1176700/43837773647.pdfIn PDF document text
    • http://setifol.66ghz.com/luzebubelebolobazofamitu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rubijisezet.epizy.com/lumulerelafazi.pdfIn PDF document text
    • http://zuwapiw.rf.gd/chef_hat_clipart_vector_free.pdfIn PDF document text
    • http://xegefonupekowa.epizy.com/vexuzupudixirakatixupod.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/vogeda.pdfIn PDF document text
    • http://rarezutawuwelam.epizy.com/mountains_into_molehills_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/upside_down_cyclone_video.pdfIn PDF document text
    • http://tirinito.epizy.com/minecraft_pvp_server_map.pdfIn PDF document text
    • http://bevowamudad.epizy.com/blank_calendar_template_june_2020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 5436 bytes
SHA-256: 870aef17152452f25caaa1accbad48824d34c764350eede043be895d44da7606
font_01_sfnt_off000101d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D0 10588 bytes
SHA-256: 4e80fae31b22be8d896cf4f1ed3b7da9578e28e3ae0b177609947c59916c86b2
font_02_sfnt_off0001262f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262F 17036 bytes
SHA-256: 5ee59e27ace71b5d9b064e870aa1309f1782778784ca7c766487394dda289460

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