Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ca69fe7f166a85…

MALICIOUS

PDF

77.5 KB Created: 2021-03-05 11:13:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 182dc8c850706f0d11d6e9b199cdcf47 SHA-1: cfccd6a896df37e0c61f1e89a8d1e31d871aa388 SHA-256: 72ca69fe7f166a8560e5a49b2f0eb44954f1376bd6c9f225f9b1261b2e3e321b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains a title that translates to 'What to answer to an indecent proposal', aligning with the phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=que%20responder%20a%20una%20propuesta%20indecente PDF link annotation
    • https://cdn.sqhk.co/suxavawudomo/ijheRji/53885391512.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/jakMTid/99822217533.pdfIn PDF document text
    • http://netzamka.ru/penezejemanufamiler7fz27.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/troy_bilt_horse_tiller_tines_wont_engagek9tsy.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/ghjhQBg/71308808583.pdfIn PDF document text
    • http://getchambre.xyz/jagiravapu57a17.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/iS4KMDc/samsung_push_service_has_stopped.pdfIn PDF document text
    • http://karaulovlife.site/37477221807frsv6.pdfIn PDF document text
    • http://topfrag.rip/michelin_guide_japan_2020vwgwl.pdfIn PDF document text
    • http://trujillostacoshop.com/what_is_the_features_of_feminist_literary_criticismhj61q.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/iyjj1hb/heroism_meaning_in_tamil.pdfIn PDF document text
    • http://vk-settings-change.online/time_speed_and_distance_problems_witvu4pj.pdfIn PDF document text
    • https://cdn.sqhk.co/detazido/uYhgpge/bucket_list_ideas_for_kids.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/XY18Bgf/frogger_retro_arcade_game.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/hhd1hid/voruda.pdfIn PDF document text
    • http://prostosite.site/diktator_quartett3js7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_ba3289aa452844f5b3b0392a03639e3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/bates_motel_season_4.pdfIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_3dc2f1c4b7354be18bcb8e63b0b0728c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/cracking_codes_with_python.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_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 5096 bytes
SHA-256: b2ab6f5c42c255029a8327e778ce119124d1a329a4e6766d98abca2de3758844
font_01_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 12112 bytes
SHA-256: 2e40485ea45803de5ebeb1fa784b89bb898434676ee457ba1135f1d0171af067

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