Malicious PDF — malware analysis report

Static analysis result for SHA-256 9494d582eab6f635…

MALICIOUS

PDF

73.8 KB Created: 2021-03-25 11:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f351c16a4a94c1f0b925e3a7b9acf8c4 SHA-1: b6a6ae7a9f80b676ecd6f069cd15c1f3f87f45e8 SHA-256: 9494d582eab6f635486c2eba625566f064949f6291d68e73bda1f8d39bb2ba74
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://baarspo.ru/123?utm_term=asl+fingerspelling+practice+worksheets PDF link annotation
    • https://tovujitirufozi.weebly.com/uploads/1/3/4/8/134853008/9934415.pdfIn PDF document text
    • http://ferobuxanax.iblogger.org/hospital_acquired_pneumonia_guidelines_philippines.pdfIn PDF document text
    • http://rejamar.sportsontheweb.net/88158638666.pdfIn PDF document text
    • https://rigawegafo.weebly.com/uploads/1/3/4/5/134587157/94fbc61b3987b8.pdfIn PDF document text
    • https://zojipulororasa.weebly.com/uploads/1/3/6/0/136011419/6394330.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/the_bride_julie_garwood.pdfIn PDF document text
    • https://xojunujad.weebly.com/uploads/1/3/1/1/131164104/df468.pdfIn PDF document text
    • https://bizotimugir.weebly.com/uploads/1/3/1/1/131164076/suzux.pdfIn PDF document text
    • https://sowematawenuw.weebly.com/uploads/1/3/1/1/131164153/mixivev.pdfIn PDF document text
    • https://topigofifudonif.weebly.com/uploads/1/3/5/3/135304546/06e843b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7bb935-207e-42e6-846e-4bfd21d4c38c/what_kind_of_lawyer_does_wills_and_trusts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d60fbcca-43e0-43c5-b088-982d798041f8/world_sandwich_day_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bde06688-4ca2-4571-8c2d-4534fb09c28c/phrasal_verbs_with_telugu_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b6da3d-b08d-45ca-acd2-ca6ab53613f6/the_master_key_to_riches_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc3df2cc-d22a-4cea-bc9d-9b9d42fad14f/onn_bluetooth_in_ear_headphones_directions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7360517-420e-4596-91de-2588aa67eff5/lol_patch_10.16_release_date.pdfIn PDF document text
    • http://tunizalureb.rf.gd/sizaxefoxegakanaf.pdfIn PDF document text
    • http://toxefokofa.epizy.com/attestation_de_stage_modle.pdfIn PDF document text
    • http://kinutumuzikuji.epizy.com/55041059832.pdfIn PDF document text
    • http://pafudepepov.rf.gd/jegevesixixodasafoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31748d88-1fd3-4e5e-a892-c15a3b863526/how_to_boost_calorie_in_foods.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_off0000e1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 5420 bytes
SHA-256: ed59b8213e07bde3d82a8bc96ff4ce905041fe8d4a582b05ba0ec7dd9a8b0abf
font_01_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 10500 bytes
SHA-256: 5d463b93a2a748b34d826f8f8d0f36a5a49c4133235e88d53a8bda53c4bb0935