Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d561ac9ad59c84…

MALICIOUS

PDF

98.7 KB Created: 2021-03-30 06:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5000f972ad22941303988a8e51b64cbe SHA-1: 90fb1a1cd8194aaa2b0854a8f6365c1d80db9404 SHA-256: 91d561ac9ad59c84558f592260bd113ba79786983fc8f19ef23f8bf17b4c9931
126 Risk Score

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 0.9997

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/award?keyword=bilanz+lesen+und+verstehen+pdf PDF link annotation
    • http://copyrightsupport-ig.com/sadefimarefuneg1m296.pdfIn PDF document text
    • http://otomail.business/outline_map_of_africaqvqfq.pdfIn PDF document text
    • http://stavki.link/5852463481037p9h.pdfIn PDF document text
    • http://alsamcctv.com/uefa_top_scorer_2019_to_2020i09nj.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/xuxagupaxinekowizukablturl.pdfIn PDF document text
    • https://miregunuvarur.weebly.com/uploads/1/3/3/9/133997549/1072291.pdfIn PDF document text
    • http://hurricane1.space/integumentary_system_quiz_with_answersp92cq.pdfIn PDF document text
    • http://rodsfish.club/a_level_economics_study_guideaoo1j.pdfIn PDF document text
    • http://worldhold.online/21715882940uhb94.pdfIn PDF document text
    • https://nezivubu.weebly.com/uploads/1/3/1/3/131384481/lidofuz.pdfIn PDF document text
    • https://lipuguxe.weebly.com/uploads/1/3/0/7/130738524/56f4b70.pdfIn PDF document text
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/kesiwukarenadum.pdfIn PDF document text
    • https://gozivuwedigati.weebly.com/uploads/1/3/4/6/134612943/ec8fb47.pdfIn PDF document text
    • http://cosmostil.top/20859210861lj2sa.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
    • http://nikibulafejew.rf.gd/35341591222.pdfIn PDF document text
    • http://dizojid.rf.gd/8813112644.pdfIn PDF document text
    • http://medevigad.epizy.com/62559606995.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 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13514 5060 bytes
SHA-256: e3e1426f9f12a299eda7ae6ee6b01841c0675ac465c204a52bd16be9532aee54
font_01_sfnt_off00014641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14641 12404 bytes
SHA-256: 76a29467fd4631994cc351073422a0a47585208742515f59f2d7644afee01190
font_02_sfnt_off00016e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E2D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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