Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbddff781c22369e…

MALICIOUS

PDF

82.7 KB Created: 2021-03-21 06:07:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e3b51504c5e2bd354a1867adbc897bcc SHA-1: e22241ed7d5e34f8fbb6cf65fc4a98a3d5cff66e SHA-256: bbddff781c22369ecd26a274f44d73512db0d4aa1fcf8eddfc058d05a189a58b
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 pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this as a phishing or malicious PDF. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to potentially malicious content or phishing sites.

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 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://ponafet.ru/award?keyword=equilibrio+acido+base+pdf+2020 PDF link annotation
    • http://mabay.fun/ielts_reading_answers_of_hydrogen_carsi4x8f.pdfIn PDF document text
    • https://nugubigu.weebly.com/uploads/1/3/5/3/135323865/2322766.pdfIn PDF document text
    • http://pipvip.ru/wukajoletunudalikobe4hjm.pdfIn PDF document text
    • http://disconto50.pro/how_to_remove_the_samsung_ice_maker218xu.pdfIn PDF document text
    • http://sparzha.club/begebeferodotumejutabops5ni.pdfIn PDF document text
    • http://rokamawu.iblogger.org/juxagemepobofowep.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/lamborghini_song_video_mp4zxjb9.pdfIn PDF document text
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/marimiruwu.pdfIn PDF document text
    • https://mutolumikiwow.weebly.com/uploads/1/3/1/8/131872082/lonejasunog-bagevege-vosubefobus-nuxatozuwen.pdfIn PDF document text
    • http://reawolt.online/respironics_remstar_auto_m_series_a-flex_cpap_machinek6oee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_55bce0a556b546af93d5c8fae2398ee5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d72bfba1-f617-4dcd-ba23-fea46b6812b3/26826900712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f8a397e-64d5-4fc5-959e-a4e2be2126a1/razolon.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_ed7dc113dbe0486e80fc4cf6b9362f93.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_4f364b060c2c454385b5e39b5e629946.pdf?index=trueIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_c65439615a8d48e3926703b87c30e4cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a894ae-a8cd-412a-9a04-f47505c2f0f8/butterball_greaseless_turkey_fryer_manual.pdfIn PDF document text
    • http://fonujepurixadal.epizy.com/27321801868.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 5340 bytes
SHA-256: 996118c0fcdaa55673c8e361b1622bd21cae59de0207ff6452faf79ecacf0b02
font_01_sfnt_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 12060 bytes
SHA-256: 2bd9f8139450dceae9fb1e5fbc40e0583e9f1add674dfc6c9e3385decfc75ed7
font_02_sfnt_off00012f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378