Malicious PDF — malware analysis report

Static analysis result for SHA-256 985ac8827d83a256…

MALICIOUS

PDF

89.9 KB Created: 2021-03-09 17:41:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 008c64bfc31a7606f8b1ab50ea924321 SHA-1: 126144ec23b29acf8be26251d928dde406275a4c SHA-256: 985ac8827d83a2560a426c1906d43f122aab35ccf98fdcad96ee472842ff9ab8
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains or link farms, indicating a likely phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/wix?keyword=bonaire+evaporative+cooling+service+manual PDF link annotation
    • https://cdn.sqhk.co/rojotuwo/NhiMpjg/pemuzuw.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/fXhfM6a/46672264467.pdfIn PDF document text
    • http://tixshopclub.fun/covering_letter_template_for_jobzy1kp.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzaxepigi/tgLijhj/xogesalekaselefixim.pdfIn PDF document text
    • http://rineset.xyz/android_app_maker_software_offline0fksh.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxebiseso/ibvOggg/56045447932.pdfIn PDF document text
    • https://leduzurukidep.weebly.com/uploads/1/3/4/8/134858842/jobufesiwase.pdfIn PDF document text
    • https://tepadomuxufebe.weebly.com/uploads/1/3/1/3/131382092/fotemumanuvererapi.pdfIn PDF document text
    • https://nukivobiwej.weebly.com/uploads/1/3/4/0/134016752/8106703.pdfIn PDF document text
    • https://bepizapumi.weebly.com/uploads/1/3/5/3/135349865/nejizezunixa.pdfIn PDF document text
    • http://tryadasert.online/the_selection_kiera_cass_indonesiaqjlye.pdfIn PDF document text
    • https://fafidapumexeri.weebly.com/uploads/1/3/1/4/131437561/5a29dc.pdfIn PDF document text
    • https://gazufapojekivu.weebly.com/uploads/1/3/4/8/134890592/903093c096.pdfIn PDF document text
    • https://riwaxetonebena.weebly.com/uploads/1/3/4/3/134363930/penaketon-bugivuguvek.pdfIn PDF document text
    • http://trudogoliya.online/whirlpool_refrigerator_filter_4_ukf8001putsm.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/58320142509zk8wu.pdfIn PDF document text
    • https://bipurubozebupal.weebly.com/uploads/1/3/6/0/136082727/xotemin.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/8e14987c-5e92-4ebd-9de1-ff84aeac6ba0/how_do_i_track_us_postal_service_certified_mail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a22b01d-4f1b-4782-869d-db0e16d814a4/how_to_raise_a_girl_child.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f044521-1bc7-48c9-86ba-b6fe9cd091ac/definition_of_civil_war_in_international_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f81ad5b2-91cd-4219-b64c-1ed92de008e1/64843400345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95257571-6536-4887-bcb2-b9503a218c32/kipisigenaduxegusubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/419a0a7e-1cf4-4d0e-ae73-a17aee4c5edb/leisure_time_word_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddbaac75-895b-4869-8e0e-a496d09bb29a/nemifukuto.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_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 5360 bytes
SHA-256: 7d81bc08a4f5e49daffe5e0bf3c81a01e9201613adb2bdc0baad1dfefe219840
font_01_sfnt_off000130af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AF 12844 bytes
SHA-256: 1ffb96289b7a93fe37210262c76a0d5f2eaa18ff454d60276cb57182890b3932