Malicious PDF — malware analysis report

Static analysis result for SHA-256 91709833fac87be3…

MALICIOUS

PDF

70.3 KB Created: 2021-02-14 05:36:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 159af49580fbf21da10b22b89b72acf6 SHA-1: 2369c1d94a4e79f371dc0f16ee46a7583b9a3cad SHA-256: 91709833fac87be3c337256c0f773d8788a1b6112121fb4beda995c5ad3fd053
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings reveal it functions as a link farm, embedding numerous URLs pointing to potentially malicious content. The presence of external URIs and a link farm on disposable hosting suggests an attempt to distribute malware or conduct phishing attacks. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://maypoin.ru/wix?keyword=second+law+efficiency+formula PDF link annotation
    • http://pycnidwzxc.info/miwokizuzepumopod2raw8.pdfIn PDF document text
    • https://kerumesuni.weebly.com/uploads/1/3/4/1/134131613/gikurixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387566/normal_6019d8610b5f8.pdfIn PDF document text
    • http://kino-vezde.ru/17856949830jq1ot.pdfIn PDF document text
    • http://lesantyqas.online/77911786232yqcx.pdfIn PDF document text
    • http://ryukzak.digital/banjo_movie_song_bestwapjf04a.pdfIn PDF document text
    • https://zipawigulugug.weebly.com/uploads/1/3/4/9/134902713/rexemilomu.pdfIn PDF document text
    • http://servicesforsupport.com/subawimogisibr9ld7.pdfIn PDF document text
    • https://rizedugo.weebly.com/uploads/1/3/1/4/131453818/mitibafitaz.pdfIn PDF document text
    • http://foyou.store/beautiful_girl_photo_wallpaperzcuhp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500425/normal_5fc57313b62f8.pdfIn PDF document text
    • http://energierecrute-emplois.com/15504739167kz9br.pdfIn PDF document text
    • http://qwonder.space/47081901491qr70s.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/kisimujuk/risk_assessment_template_for_wall.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/a_bug_s_life_full_movie_hd.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 5284 bytes
SHA-256: 0e2451accb362a950561de50bd48aa78f3734b6fa2ec8545fa1deae4df2783b6
font_01_sfnt_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 10868 bytes
SHA-256: c231f851d9b0c48d7fd3ab152b2b847e3b119dc7aed271423e0f9a4a5687f525

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