Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c25351a2514e7d9…

MALICIOUS

PDF

85.0 KB Created: 2021-05-07 15:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5fe7b76e2573d36b697a62877bbf73bf SHA-1: 7257b6dc4b8e8dc96927f93bb038c2812c0a11a5 SHA-256: 5c25351a2514e7d974fad0903873c14131e61d3157ed9d4d580bcf2d8d42ed0b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

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 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.
  • 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/strik?utm_term=ms+access+2013+tutorial+ppt PDF link annotation
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://xikigojajutu.weebly.com/uploads/1/3/4/3/134385057/209154.pdfIn PDF document text
    • https://gekesixufomipi.weebly.com/uploads/1/3/4/3/134318537/0bfb8.pdfIn PDF document text
    • http://erogan-encolumbia.site/how_do_you_make_a_file_smaller_on_iphone7ug37.pdfIn PDF document text
    • http://milanomoda-italy.website/iso_27001_password_lengthlk1bj.pdfIn PDF document text
    • https://wuvobarapupi.weebly.com/uploads/1/3/0/8/130813490/jaxoj-banowobavetad.pdfIn PDF document text
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/favogi.pdfIn PDF document text
    • http://lidzadva.xyz/zutununuduwazuroreri6tbvz.pdfIn PDF document text
    • https://sujefamop.weebly.com/uploads/1/3/4/7/134762109/voreginigozezez.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/debiwelof/flight_simulator_2017_free_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce0078e-293e-4ed5-8753-fdead0ecbca8/36256654279.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/doraemon_game_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad03d706-b945-4959-961f-781f0dc96e29/14182682518.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/assamese_new_video_song_2019_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/walomoveravixox.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/avatar_the_promise_part_2_free.pdfIn PDF document text
    • http://gajutar.onlinewebshop.net/manorama_weekly_latest.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/is_karr_alarm_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3233438-05e1-44f5-a4a8-1a373cedad6f/d3_ros_save_editor_xbox_360.pdfIn PDF document text
    • http://kubomefewofumim.atwebpages.com/66517378433.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_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 5424 bytes
SHA-256: 3942531cf70781eeeb5545a10965e81a54d33e1d12df58e1a0bf8fec8d19a39a
font_01_sfnt_off000122c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C9 10540 bytes
SHA-256: 9e756cad0b387994ed8926708c720e0a6f72c3205ff2506109f2b5be5280339c

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