Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a1b37485623f79…

MALICIOUS

PDF

73.3 KB Created: 2021-02-25 01:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0d5dd30ddb3eb8bf834268d10dea990d SHA-1: 94835ed98ac542112369d6d0d819aaddde86b1b9 SHA-256: 29a1b37485623f79f074e528a4ad71b35e76049e267f1fb0591ce2163c913d7b
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm designed to redirect users to potentially malicious sites. The presence of a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and ClamAV detection further supports its malicious nature. While no scripts were explicitly extracted, the structure suggests an attempt to leverage external resources for malicious purposes, likely phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=shiloh+by+phyllis+reynolds+naylor+summary In PDF document text
    • https://cdn.sqhk.co/gawisibiw/eX0ifQQ/javolole.pdfIn PDF document text
    • https://cdn.sqhk.co/wewowedim/IYgcSOL/hidden_valley_road_colorado_springs_book.pdfIn PDF document text
    • https://ruliduwaj.weebly.com/uploads/1/3/4/0/134016670/bufikowoxutejemor.pdfIn PDF document text
    • https://cdn.sqhk.co/puburikob/JYOjcko/labemuvenidox.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/igIggjf/stampede_meat_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/jdjgpRq/stickman_backflip_killer_5_mod_apk_unlimited_money.pdfIn PDF document text
    • https://selilanabos.weebly.com/uploads/1/3/4/8/134875664/sotexudezotarizaleva.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/fihfhbF/ice_scream_episode_2_horror_neighborhood_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/ifmVicb/petroleum_engineering_university_of_florida.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/yXjcjb5/craft_warriors_mod_apk_4._2._9.pdfIn PDF document text
    • http://pabufit.22web.org/rch_guidelines_febrile_seizure.pdfIn PDF document text
    • https://lixawedubofalat.weebly.com/uploads/1/3/1/4/131407760/nikuw.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/Oijhcmn/tokumebebirexuk.pdfIn PDF document text
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/bujalazubezojif.pdfIn PDF document text
    • https://juputifewusa.weebly.com/uploads/1/3/4/4/134435955/wuvidutekozigo.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/verirejon/juvuxotekabejabirato.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/java_jre_7_offline_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/setalovimebibaz.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_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 5544 bytes
SHA-256: 6e7e0d929b2eb8400d13d43fb3294ddd73cbbd28f6bd327258bd2ad9ab7f2103
font_01_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 9492 bytes
SHA-256: 69c6f5e76e13913392c54e25d96e1c51b49b72c52b7e389648d299cc826e68a3

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