Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33efc6dc5554782…

MALICIOUS

PDF

73.5 KB Created: 2021-06-06 07:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: df0f5ff318cef46a596f3ab8e693fc02 SHA-1: e5739a022f4932e5220b9d2f9b430ac44e7ec829 SHA-256: c33efc6dc55547826029358aacbc6946be4323ef2b825412ea4b364f9c2ff048
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though partially garbled, includes text related to 'Platicas pre bautismales en aguascalientes' and a URL pointing to 'irlanc.ru', suggesting a phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest malicious intent, likely to redirect users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/pbw?utm_term=platicas+pre+bautismales+en+aguascalientes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411686/normal_603ab813c5395.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446016/normal_5feb574aafd01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422385/normal_6006b92456268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482424/normal_5fd77a56782ba.pdfIn PDF document text
    • https://puzileto.weebly.com/uploads/1/3/4/6/134674509/7390951.pdfIn PDF document text
    • https://lofuniwap.weebly.com/uploads/1/3/0/8/130874201/fomunebitogu.pdfIn PDF document text
    • https://fiwibafufo.weebly.com/uploads/1/3/0/7/130774969/vomuj-dozezeru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buwutel.pbworks.com/f/rikoputajixejureb.pdfIn PDF document text
    • http://wuranosa.pbworks.com/w/file/fetch/144412635/butelafikom.pdfIn PDF document text
    • http://fevawigo.pbworks.com/w/file/fetch/144419265/gta_5_download_for_android_apk_and_obb_without_verification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8a6a94-f8a9-45d7-a652-e78f31f98cbb/18013016241.pdfIn PDF document text
    • http://zeratuwolima.pbworks.com/f/how_can_i_find_my_facebook_friends_on_snapchat.pdfIn PDF document text
    • http://fetinaduv.pbworks.com/f/nimirisinabiv.pdfIn PDF document text
    • http://fokojifidesi.pbworks.com/f/puxex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0a6c99-5beb-4f0d-9273-46bbedcff389/midmark_m11_ultraclave_user_manual.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/classification_of_words_in_english_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/174886f6-6f97-4e41-b135-ff40441978c4/how_to_fix_a_leaking_badger_5_garbage_disposal.pdfIn PDF document text
    • http://gosirata.pbworks.com/w/file/fetch/144451446/zugixemuzetotifixoguxedup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d96cd7dc-d372-4e71-8aec-6ef8bfd339cb/hollander_interchange_manual_download.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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 5392 bytes
SHA-256: 085273727f43a42a6b5e68d55b01ce118a79a9cd9d1751f85d39b65f6ce69309
font_01_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 12080 bytes
SHA-256: 81224906404293afde2d912578da4ac2cc32eafb8af92d191ba9df1e18f02947

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