Malicious PDF — malware analysis report

Static analysis result for SHA-256 185fb84910ef661d…

MALICIOUS

PDF

71.8 KB Created: 2021-02-21 04:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ab2a3903caf5a4f1891c7550e8adae3b SHA-1: d5501506237b92b42c5a1508991866d33f102fa8 SHA-256: 185fb84910ef661d0260e4e8bd8dde7252392c6e2ace16d8be14c82519432501
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, with a notable heuristic indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, contains text related to 'science words' and mentions the authoring application, suggesting a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/wix?keyword=science+words+that+start+with+kin PDF link annotation
    • http://sell-toclick.online/15651625068hrlyg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458849/normal_60183127dce29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479715/normal_5feee0b498c4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466146/normal_5fff92cc9060a.pdfIn PDF document text
    • http://exemplpusj.com/papunevedegemezewzlksu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406787/normal_600c470f3a263.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382771/normal_5fed62d2b1219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443356/normal_6025bf9c63e92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_60209a962dbfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369165/normal_5fe4e09a8ff3e.pdfIn PDF document text
    • http://brettlockhart.com/420687233968egxs.pdfIn PDF document text
    • http://atlas-copco.su/magic_chef_electric_pressure_cooker_manualnn7vi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367922/normal_60053073a2cac.pdfIn PDF document text
    • http://bluebadge-support.com/maduvipotuwauiu9x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426267/normal_5fced0b4427ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gogonof/alcoro_em_portugues.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/sequin_formal_long_dresses.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_off0000dc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC75 5256 bytes
SHA-256: 441a18439a7dadafac1506fef9f55e34ca5dc447112998f0fb22d4d08ee4ad4a
font_01_sfnt_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 10684 bytes
SHA-256: 2d9326b10aa64b8bf7f82380a7073d08777770b7c3faffb0db6d544f4bf0dac3

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