Malicious PDF — malware analysis report

Static analysis result for SHA-256 b371594ad5132e6b…

MALICIOUS

PDF

75.0 KB Created: 2021-03-25 08:14:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 57dceea3f0d8f46c3bba756ba1e53976 SHA-1: 167053ee976887cf7f5b219af6c77136aef7aea6 SHA-256: b371594ad5132e6bc95f567c42e23aecffc3ed2ad358bd76c3afaef308cd68f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/wix?keyword=mortal+kombat+x+mega+mod+apk+android+1 PDF link annotation
    • http://xadojewivo.iblogger.org/how_to_use_sun_joe_pressure_washer_2030.pdfIn PDF document text
    • http://sokfresh.fun/business_management_certificate_classes66bz4.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/11718501761.pdfIn PDF document text
    • http://tofugezupeb.mygamesonline.org/hannah_howell_murray_clan_family_tree.pdfIn PDF document text
    • http://lakujalinifibo.mypressonline.com/californication_lyrics_and_chords.pdfIn PDF document text
    • https://peguduzivinaw.weebly.com/uploads/1/3/1/6/131606374/34395a.pdfIn PDF document text
    • http://tonagruz.ru/nfl_week_7_predictions_2018_bleacher_reportcoyzu.pdfIn PDF document text
    • http://jajolamuseku.medianewsonline.com/gafitebil.pdfIn PDF document text
    • https://tobevasisutigi.weebly.com/uploads/1/3/0/8/130814636/8848052.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mogonowipekizo.epizy.com/6718186929.pdfIn PDF document text
    • http://teluroluxeterez.myartsonline.com/how_to_update_pantone_color_books_in_illustrator.pdfIn PDF document text
    • http://pezefaxovojole.atwebpages.com/apollonia_ponti_20_questions.pdfIn PDF document text
    • http://lepamiv.epizy.com/togakarabalakagopagoket.pdfIn PDF document text
    • http://mavavopem.rf.gd/how_to_win_the_lottery_guaranteed_uk.pdfIn PDF document text
    • http://bezixezejagu.rf.gd/jafoleduwit.pdfIn PDF document text
    • http://roninifuwevol.rf.gd/kunenafiweninasuraxamutu.pdfIn PDF document text
    • http://xogorilefad.epizy.com/94991593136.pdfIn PDF document text
    • http://jamenajiko.myartsonline.com/tagalog_christmas_songs_chords.pdfIn PDF document text
    • http://powavowuzipuvu.epizy.com/36296985523.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_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 5428 bytes
SHA-256: 84af619572ac1c03632013ea41e69a0d1eef064620b951ff6489d3f7571aa2f7
font_01_sfnt_off0000f9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 10836 bytes
SHA-256: b0ffd48c838841d421676e9637751f9ca94148dded49901de22846988426fce3