Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f1ee7bbb02c3c3…

MALICIOUS

PDF

81.9 KB Created: 2021-05-16 10:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9bd07fcd11a0340cce132e52b5f55815 SHA-1: b33a5cd1871c10f8cb763b3a49e42f5f81d1071b SHA-256: 49f1ee7bbb02c3c36ecc2d94307052844d9a7803f14dffa4ebb75f551161d672
186 Risk Score

Malware Insights

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

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 0.9958

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://fokemale.ru/strik?utm_term=linear+and+digital+integrated+circuits+ppt PDF link annotation
    • https://cdn.sqhk.co/golomamone/jigQ2gg/hello_telugu_movie_bgm_ringtones_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/eohcLhb/pip_happier_music_video_marshmello_happier.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/ejjIcrz/animated_glitch_wallpaper_gif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_6052495932fa6.pdfIn PDF document text
    • https://cdn.sqhk.co/kewebogi/QPyuvhe/do_uber_drivers_support_prop_22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5fd8b54e0eb1f.pdfIn PDF document text
    • https://cdn.sqhk.co/godanalumado/udFmmgd/96022040135.pdfIn PDF document text
    • https://cdn.sqhk.co/morureju/gbhbObD/3854904353.pdfIn PDF document text
    • https://cdn.sqhk.co/vevigagexoxa/id2jgn8/mofadajonugofewuse.pdfIn PDF document text
    • https://cdn.sqhk.co/xafemepino/ElgUhaA/nosuzujipulikiguzenaba.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/IijpNii/hyperspin_setup_buttons.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/GhcqPhj/sword_art_online_game_ps4_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/wosuzumamig/8X0Ojd1/autograph_tamil_full_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479923/normal_60311a4f5b3dc.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/gcEgdGA/darksiders_forbidden_lands_review.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/jfjcjjb/80454567847.pdfIn PDF document text
    • https://cdn.sqhk.co/gepaxulunan/je1jdHZ/86547417034.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_a36e45eb0c3b4809894ce8056835c11d.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_0db0956b207141ebab40c6c7d7804b78.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_0e0369df721a43aabc2f23b9b93b951a.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_f55d30b8b2fa4b4599bb9f5c2e28b858.pdf?index=trueIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_998332d0210d43e5a900ad9e85060d85.pdf?index=trueIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_8e4feea8e2574b0b802e8bd8af0319b0.pdf?index=trueIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_2f959173a9e249b5808dfcd37156c470.pdf?index=trueIn PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_c63bffb29c674f979ea99cf8e3497c70.pdf?index=trueIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_6c807a960b884af583bac69b6bb45920.pdf?index=trueIn 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_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 5184 bytes
SHA-256: 251dfc9b3fcad6335ef6afe01cbcb9d6b7de32b3ab634828b5887b484fa2ce1d
font_01_sfnt_off000111eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 11568 bytes
SHA-256: 82599ab22f61da834c6afff295e1713d13fe4f4988d900b0992ce05d6c6d471c