Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffaddffb68115691…

MALICIOUS

PDF

80.0 KB Created: 2021-03-10 16:50:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 79e2674c78d150f20e751ec4b3c7accc SHA-1: 7859423e916afd39be9b0e4f309a29a81fc09a80 SHA-256: ffaddffb681156912b3a32e68f08542c779b6c5f9a35367cf1fb01bd93b425fc
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. One of the primary URLs, 'https://bologen.ru/123?utm_term=beloit+school+district+report+card', appears to be a lure for users interested in school district information. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=beloit+school+district+report+card PDF link annotation
    • https://sumukekunazub.weebly.com/uploads/1/3/5/4/135400219/1114507.pdfIn PDF document text
    • https://rosaguvedofim.weebly.com/uploads/1/3/4/3/134352906/zodopipopefavudimam.pdfIn PDF document text
    • https://cdn.sqhk.co/nedevupoj/ahaifif/wikixegowijisesadem.pdfIn PDF document text
    • https://dexuwoborusise.weebly.com/uploads/1/3/4/3/134375282/modejovufixox-fimefu-jowurewigugilav-muvopufasonupij.pdfIn PDF document text
    • https://bewanabexujafo.weebly.com/uploads/1/3/6/0/136050633/8829012.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/M3fGhjA/balance_ball_chair_australia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wopari/gugalusogodirutigasin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad8c82b2-92c2-4037-8c61-f15c248af482/hp_laserjet_2100_pcl6_treiber.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b741cb-b4f1-43c7-8c44-605cce2d1108/31901556378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8389b91-5c03-4a22-87e4-1a956eac3d4c/what_are_the_main_topics_in_ccna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a764770e-3d73-4979-82a7-913653fc0099/physics_quiz_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/a_safety_data_sheet_consists_of_16_sections.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8645835e-cfce-48ad-bc4b-51824b966caa/26633939636.pdfIn PDF document text
    • http://mawigugu.rf.gd/wunezaz.pdfIn PDF document text
    • http://molamizaxe.epizy.com/what_words_should_not_be_capitalized_in_titles.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/friends_piano_sheet_music_justin_bieber.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/biravuxurek.pdfIn PDF document text
    • http://tajisogekumobuk.epizy.com/types_of_communication_notes.pdfIn PDF document text
    • http://nasakil.rf.gd/alessandro_volta_information_in_marathi.pdfIn PDF document text
    • http://nuwowafel.rf.gd/90772418819.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_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 5212 bytes
SHA-256: 2a845ace80995d89662b39ea5fd3a4034605479ac005c38cfe11f01a7651bf7f
font_01_sfnt_off00010ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 11208 bytes
SHA-256: 050a953eaf5ec4e4ded1cead446da0edef122eb947c3eeccb71e6339101705cd