Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb28047b31df9a1…

MALICIOUS

PDF

72.2 KB Created: 2021-01-28 23:17:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ca0755bfe39a4ec7cd86facc89d8e13c SHA-1: 921911aad374b166ac0cb7f0252dbe0bed257dea SHA-256: 5eb28047b31df9a1459c6927e5d4aed587b837c3ca5e40733f87cc36e2421a8f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous external URIs, with one notable example being https://jottigo.ru/123?utm_term=my+heart%2527s+a+stereo+lyrics+mattyb. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jottigo.ru/123?utm_term=my+heart%2527s+a+stereo+lyrics+mattyb PDF link annotation
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/dajiwowa_sukofonidelev_nelodobino_papolokataji.pdfIn PDF document text
    • https://pugotaba.weebly.com/uploads/1/3/5/3/135302821/lipila.pdfIn PDF document text
    • http://jezolagewe.iblogger.org/32827313047.pdfIn PDF document text
    • https://cdn.sqhk.co/supekolev/rjjQCge/fifidaxejoxotajimodix.pdfIn PDF document text
    • http://epaytds.xyz/vukazuvixatapikapitinokoso3v5c.pdfIn PDF document text
    • http://xosuvirakogaf.iblogger.org/bahubali_2_video_songs_mp4_free.pdfIn PDF document text
    • http://pabixigenived.22web.org/homemade_bandsaw_mill_plans.pdfIn PDF document text
    • http://ig-socialmedia.xyz/66206390505wbs80.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/bjfS9GB/video_poker_machines_for_sale_ebay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475194/normal_5fe195fba135a.pdfIn PDF document text
    • https://cdn.sqhk.co/giwegulatil/ijgjhVL/doduxijag.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/cSjpEjd/63727493735.pdfIn PDF document text
    • http://winoorama.site/20713424891zpx6d.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/word_colour_code_commentssycpy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvufajozurez.rf.gd/conditional_formatting_in_excel_2010_tutorial.pdfIn PDF document text
    • http://donenufalu.rf.gd/audacity_recording_program_free.pdfIn PDF document text
    • http://giwofigu.epizy.com/electrical_engineering_syllabus_2018.pdfIn PDF document text
    • http://gobavaduxa.epizy.com/65296040102.pdfIn PDF document text
    • http://magelul.epizy.com/cardiovascular_physiology_9th_edition.pdfIn PDF document text
    • http://rodiwube.epizy.com/new_pokemon_game_2019.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_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 5320 bytes
SHA-256: 0390e788fc8e1228a3a141f5200a698f15cc4daba5d259365d46a70c58adc888
font_01_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 10024 bytes
SHA-256: 762e3daa5c9984734e08a546184726711d4ba070eda6f0d4bd3d5dc3414f293e

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