Malicious PDF — malware analysis report

Static analysis result for SHA-256 90370a01b159ed18…

MALICIOUS

PDF

80.8 KB Created: 2021-03-04 18:42:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a1071aee92302e256cd0f2452044e1c0 SHA-1: 8c644fa37b115688ee6034d4b4ae326f453e8694 SHA-256: 90370a01b159ed183c9df41ab1bc6ba827b206ccc5f7ac35230e206a973e4a98
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or distribution point for malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing or malware distribution campaign.

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://leonvi.ru/123?utm_term=how+to+fix+treadmill+belt+not+moving PDF link annotation
    • http://eslivdrug.space/fl_studio_12._1._3_crack_onlyymxrj.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/6jhjikw/car_race_2019_extreme_crash.pdfIn PDF document text
    • https://betisifi.weebly.com/uploads/1/3/1/4/131438474/8cda8.pdfIn PDF document text
    • https://mirulunus.weebly.com/uploads/1/3/1/1/131164386/duzolimerenox.pdfIn PDF document text
    • https://xuxedujuwa.weebly.com/uploads/1/3/5/3/135345360/xuxotujokenunap_pavejug_mexuvila.pdfIn PDF document text
    • https://cdn.sqhk.co/podidiwi/ib6gfn4/43278842047.pdfIn PDF document text
    • http://parhelifrl.space/nutupvldk0.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/dha6tjd/infamous_movie_2006.pdfIn PDF document text
    • https://wituxilozixataw.weebly.com/uploads/1/3/5/3/135317309/1381149.pdfIn PDF document text
    • http://wiregabjuk.fun/what_factors_led_to_the_renaissance_in_northern_europe1f4ug.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/ijje7eg/somepimi.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/fetomujum.pdfIn PDF document text
    • http://digitalmicroteter.xyz/ogilvy_on_advertising_paperback0oynf.pdfIn PDF document text
    • https://cdn.sqhk.co/modebopogut/jaheeii/solar_system_3d_simulator_m_i_nh_t.pdfIn PDF document text
    • https://givigifug.weebly.com/uploads/1/3/4/8/134858651/tosirumi-pivigazuzopipop.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/hbLjg2w/wifi_analyzer_apple_store.pdfIn PDF document text
    • http://onlinekartiadesi.com/141852515864n0be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kunubuxeduw.epizy.com/arabic_alphabet_tracing_sheets.pdfIn PDF document text
    • http://kawurox.epizy.com/diversification_alimentaire_bb_6_mois.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_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 5368 bytes
SHA-256: 6964bfdd1e41e5fc335cff16660559d7a2083548fa1a52495962a137b7c67b98
font_01_sfnt_off00011196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11196 10644 bytes
SHA-256: 583a64078960f511b5500679305ef41857c6c1a752be072176544b59d06de979

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