Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec6cf54b768e08a…

MALICIOUS

PDF

75.3 KB Created: 2021-06-02 20:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 923c77bde211cb0274aae8217fda3b32 SHA-1: 0e311cca436ffe1475e253382c8a92c4d950571a SHA-256: fec6cf54b768e08a46f79213dbad57b78b88bd6382bad189dce63f8eb22ef93b
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, indicating it is part of a link farm, likely for SEO manipulation or to distribute further malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://philabc.ru/pbw?utm_term=can+you+use+bissell+crosswave+on+wood+floors PDF link annotation
    • https://gifoxulexup.weebly.com/uploads/1/3/4/8/134865115/9546258.pdfIn PDF document text
    • https://kigilepoda.weebly.com/uploads/1/3/4/9/134901239/tebenesi.pdfIn PDF document text
    • https://nejatavesosib.weebly.com/uploads/1/3/7/5/137516269/sevutekor-vefosowa-nonufebisu.pdfIn PDF document text
    • https://lumuvimusu.weebly.com/uploads/1/3/4/7/134719948/5026187.pdfIn PDF document text
    • https://kikosezuzo.weebly.com/uploads/1/3/1/3/131378972/lawis.pdfIn PDF document text
    • https://puxajibixitukus.weebly.com/uploads/1/3/4/4/134457664/8a195791.pdfIn PDF document text
    • https://gininigexaviw.weebly.com/uploads/1/3/5/3/135350692/9099259.pdfIn PDF document text
    • https://tetavezodumop.weebly.com/uploads/1/3/4/6/134645623/tugiseke.pdfIn PDF document text
    • https://xujesosa.weebly.com/uploads/1/3/6/0/136090165/kofujikikamulaz-lefipumop.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/bekugigejije_gadozuxixu_xejigivin_sozax.pdfIn PDF document text
    • https://pepajodik.weebly.com/uploads/1/3/1/4/131453945/5600248.pdfIn PDF document text
    • https://fusarutuzazeni.weebly.com/uploads/1/3/5/3/135346017/kejuk.pdfIn PDF document text
    • https://vekibapovadivoz.weebly.com/uploads/1/3/0/8/130873848/sezixagidolasefuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fagimox.pbworks.com/f/rusodim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d1e5940-4bcf-4e70-8365-33a83f5e382d/how_to_change_the_time_on_my_versa_lite_fitbit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a651265-c485-4ff4-80c3-7d4c6d6f55c8/liminal_thinking_book_review.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/f/17421245644.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/how_do_you_treat_borderline_personality_disorder_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17eec503-b9cf-46ed-a5e6-dbe22832a6e1/21536293999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96d62de1-09ab-4653-b9f3-e5482785357e/functional_trainer_ab_exercises.pdfIn PDF document text
    • http://gabumur.pbworks.com/f/what_is_the_best_free_iptv_player_for_firestick.pdfIn PDF document text
    • http://serizedez.pbworks.com/f/how_do_you_treat_coliform_bacteria.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_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 5316 bytes
SHA-256: b25aeab28496b8e60d6bf122c957e2986e3a181862197f383745b20d997740b0
font_01_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 10480 bytes
SHA-256: 1e95c5c113b89d47d0b3f076edb14a74d94b54ad5420e6c9bef46bcb9fcb050f