Malicious PDF — malware analysis report

Static analysis result for SHA-256 52826c00125c365c…

MALICIOUS

PDF

64.4 KB Created: 2021-02-14 21:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 56b03f6280e4e30b9878f405eda29b28 SHA-1: 0ed908b9bb7347b9bef9a3732d9500e66e880474 SHA-256: 52826c00125c365c08f03ecd027ed11439ec6ef87c7aff0a7e4a05bb3e88f916
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/wix?keyword=supersu+apk+mirror PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449397/normal_5fdbde7ebd715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413575/normal_60185c1d43900.pdfIn PDF document text
    • http://razvivatel.blog/319974155445dxx4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_600fd5a0cc4f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462056/normal_5fe06f45c9d3f.pdfIn PDF document text
    • http://larts.digital/sojijisejawodu5wmo3.pdfIn PDF document text
    • http://septiki-rf.website/vutuwotefgcmi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388271/normal_6003c3d18d22c.pdfIn PDF document text
    • http://natfreshik.fun/counting_philippine_money_worksheetsogb8l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423732/normal_6010fe9a1ed6c.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/vukujidor/kolifibepewu.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/44441531321.pdfIn PDF document text
    • http://datasixiva.epizy.com/98523008277.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/linear_programming_algebra_2_worksheet_answers.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC006 5100 bytes
SHA-256: 288ef60c853efdd2cb6926961f8ad3e5ba7c4941aba75c43f4d45893644944e6
font_01_sfnt_off0000d14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14B 10508 bytes
SHA-256: 15f5d8927dac07694aa24f001f813f50c339219dcffd96887aa68ae0df781a6b

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