Malicious PDF — malware analysis report

Static analysis result for SHA-256 7529fddce5738429…

MALICIOUS

PDF

72.0 KB Created: 2021-02-21 03:47:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e990390e3c950d6eb22b63a249fb3719 SHA-1: 73cac6d4b9befcee468e3873af03ba900ab480ae SHA-256: 7529fddce573842907e64bd306c99df39a10e4d166d3f44ab18c06fff8eafb1d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though partially corrupted, references 'Sister outsider book club' and 'wkhtmltopdf', hinting at a lure to external content. The presence of numerous external URLs points towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wb?keyword=sister%20outsider%20book%20club PDF link annotation
    • https://cdn.sqhk.co/serodozire/moCheGA/tatazorimujij.pdfIn PDF document text
    • http://pixell.store/fesoledegusezunabomavofomydfow.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/Vqfjejb/space_shooter_mod_apk_unlock_all_ship.pdfIn PDF document text
    • https://kimilofu.weebly.com/uploads/1/3/0/8/130873947/dd1d9febaae977.pdfIn PDF document text
    • http://5-euro.info/360785469974hsug.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/hsiaieO/30889161353.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381302/normal_5fc66f5c17e16.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/0jephes/microsoft_onedrive_app_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/bWibagj/dining_room_sets_cheap.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/hVS5Thc/oneplus_switch_backup_app_data.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/z0ZFjg9/diversified_members_credit_union_novi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_60176e6b96693.pdfIn PDF document text
    • https://cdn.sqhk.co/zivupowixede/hQdO0ha/beach_buggy_racing_online_pc.pdfIn PDF document text
    • https://rujijixagav.weebly.com/uploads/1/3/1/3/131383475/natiliwakijozuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455660/normal_60201408e62ae.pdfIn PDF document text
    • http://ukranews.icu/11669494681lx9mo.pdfIn PDF document text
    • https://denosuzasagi.weebly.com/uploads/1/3/2/7/132712615/3517538.pdfIn PDF document text
    • http://oneitshop.pro/fegudal18ca.pdfIn PDF document text
    • https://cdn.sqhk.co/tizuvuwo/ihAnrfc/zejasefajazexawomopavevob.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/herYigw/58916131388.pdfIn PDF document text
    • https://vomerigovelaj.weebly.com/uploads/1/3/4/9/134901888/2186517.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE08 5028 bytes
SHA-256: f276c95fb445ea380016e8542674c2698b79ecdff67c7e413c15202cfd92c28c
font_01_sfnt_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 10580 bytes
SHA-256: ab632a24b527e1ea2d50219b90f59871d7121d39c11ca7e443a6eeb1fc4c8a71

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