Malicious PDF — malware analysis report

Static analysis result for SHA-256 11255357b57c7dfd…

MALICIOUS

PDF

80.3 KB Created: 2021-03-15 00:01:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6bf4306b26695dead430eb1daa547127 SHA-1: c3cb084c2400f57223713f889c620214a6b52627 SHA-256: 11255357b57c7dfd9b71d9361350d73fe1c08e2533742af5fdb6b41e1c4ce7c6
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/123?utm_term=android+screen+gone+black+and+white PDF link annotation
    • https://cdn.sqhk.co/wisewuguv/jdNibhb/mda_drug_definition.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/why_is_my_spectrum_cable_tv_not_working.pdfIn PDF document text
    • http://kuliwegi.sportsontheweb.net/used_car_purchase_checklist.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467936/normal_6022bd755b0f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459174/normal_603f5992d6ab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_600c8ce3da52b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_604a1b7c14564.pdfIn PDF document text
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/padejixemidujafitor.pdfIn PDF document text
    • https://ripodomix.weebly.com/uploads/1/3/0/7/130775876/2280574.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/20094669096.pdfIn PDF document text
    • https://niwanokanu.weebly.com/uploads/1/3/4/5/134592400/fatiminefaze-junenuzez-duxuva-famosupo.pdfIn PDF document text
    • https://cdn.sqhk.co/raxasumo/geibMij/fifa_world_cup_2019_men_s_soccer.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/fitbit_versa_lite_update_problems.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477400/normal_600e8dacb41b3.pdfIn PDF document text
    • https://xinofebew.weebly.com/uploads/1/3/5/3/135305957/rajujanalenixakup.pdfIn PDF document text
    • https://cdn.sqhk.co/wenavuso/3rLicCv/56275924798.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/MhfZjeB/remove_curse_dark_souls_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_6f067f3100264e2eae4f0a150d7dd2b5.pdf?index=trueIn PDF document text
    • http://tiwatimab.atwebpages.com/21349687492.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_14675fdec1264997b982d3c8d84cd81a.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_dbd0d33f97ba4b1b9ec6d40802e69c65.pdf?index=trueIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_2cc18d137a144f89ab18327ee05d3ba5.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_951d90add3ca41d6b0e2d4a7e3b60b31.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_4e09fcc3c65e4c9baf8e9c3885e64724.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_ac90ce34d4f54d9597210bd86c1add14.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_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 5484 bytes
SHA-256: 89e0fc76bcb064ffed83e55d536d422165ed27b61eb6f56dab023f94afc28793
font_01_sfnt_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 11124 bytes
SHA-256: b335dbdd5cf29dda63298828c7ff443953816f08b51a28735149bb387883af38