Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89832a3d48900c3…

MALICIOUS

PDF

65.1 KB Created: 2021-02-13 10:18:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b6899f5de863eb1be6685ff95a5d6c0e SHA-1: 831b90620673d9a4c95bd1c5a10749ee06247ac7 SHA-256: a89832a3d48900c3d6759b22fe44c16741074ced14ba476a32692310fc369345
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic findings point to the PDF acting as a link farm, with numerous embedded URLs, some of which are hosted on disposable domains. This suggests a phishing or malware distribution scheme, likely using the embedded links to redirect users to malicious sites or download further payloads. The document body contains garbled text, but the presence of wkhtmltopdf and Qt suggests it was generated programmatically, possibly to obscure its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=tu+online+hai+audio+song PDF link annotation
    • http://gnoogle.site/bihar_tet_2020_notificationn97m1.pdfIn PDF document text
    • http://national-verifyteam.com/one_piece_bounty_rush_apkmonkjqpul.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/benzi_desenate_romanestin3wz7.pdfIn PDF document text
    • http://dakujuzoma.22web.org/khadya_patrata_parchi_mp.pdfIn PDF document text
    • https://jetisinodab.weebly.com/uploads/1/3/5/3/135335938/tefotamufuwebonabive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375700/normal_5fe82ee1b9e9b.pdfIn PDF document text
    • http://gokojemisivuf.22web.org/weather_report_port_dover_ontario.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410985/normal_5fdfc319d43e6.pdfIn PDF document text
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/2375472.pdfIn PDF document text
    • http://pitushok.space/30239383732v5fud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nasutewu.epizy.com/xaferexu.pdfIn PDF document text
    • http://fosixijikalapi.epizy.com/fishing_report_nysdec.pdfIn PDF document text
    • http://gulavofi.epizy.com/powikamimibibirotivozer.pdfIn PDF document text
    • http://fonimegalidoxu.epizy.com/android_studio_windows_10_pro.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_off0000bff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF1 4940 bytes
SHA-256: 7f27853839b1e625af5e3a6fbfb85ef5fbb6351d35d922b8517c266e672374cd
font_01_sfnt_off0000d0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B8 11668 bytes
SHA-256: 6f8696eb11e2a8a32fb576d5786434efadc7aa2d5c2af91c25d4d1d82090ce77

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