Malicious PDF — malware analysis report

Static analysis result for SHA-256 168ed5c2eec056b9…

MALICIOUS

PDF

98.8 KB Created: 2021-03-20 08:54:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3d9aca477e7a035a9aa8133881c97315 SHA-1: 65f203189a90121853cbda060b13d869a1167c28 SHA-256: 168ed5c2eec056b936e6054023d9a63ada9a10bc45e00e334749b47ecdb37fe0
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/123?utm_term=android+9+pixel+2+xl+review PDF link annotation
    • https://cdn.sqhk.co/wajinevisu/isS1hfG/classic_games_100_games_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/fezavomol/5hh7zji/werigovaloxubafekiw.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/PHhbpOJ/hello_neighbor_act_3_house_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/wejideduv/dageiim/zaxowekusudugafipiwep.pdfIn PDF document text
    • https://cdn.sqhk.co/dufimogemeka/C5hdijB/how_to_switch_off_roaming_on_iphone_x.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/6BP7hjc/king_s_fund_report_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/HBWjjjl/uber_driver_app_contact_support.pdfIn PDF document text
    • https://cdn.sqhk.co/zibusisujij/jeVjcEa/72977466073.pdfIn PDF document text
    • http://pubgmobiie.com/alphabet_chart_with_pictures27rjb.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxivuxovu/chdjcgf/school_website_templates_bootstrap_free.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/vanupemelaxuxir.pdfIn PDF document text
    • https://toxavepudu.weebly.com/uploads/1/3/4/6/134634724/2458376.pdfIn PDF document text
    • https://vavunoruluso.weebly.com/uploads/1/3/1/0/131070491/tuxazajuba-zeruditiwidawa.pdfIn PDF document text
    • https://cdn.sqhk.co/ninubisidire/iijggh3/32716451049.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/ZDYihge/49113233253.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/hdWggKw/kiwapepukoxajuzewimozusal.pdfIn PDF document text
    • https://kokopepexepu.weebly.com/uploads/1/3/1/3/131379351/8788239.pdfIn PDF document text
    • http://torchqbfl.fun/percy_jackson_sea_of_monsters_book_chapter_4sohf4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/28708271-7a70-4b24-852f-ec65fb87f831/63039619455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c4b03f5-44e7-4a0a-b0fd-f6f7654da4dc/ti_84_ce_calculator_sale.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FA 4772 bytes
SHA-256: 6986dbb8f3c454d56d8d33fb6895733f2f328809a12857ab9e4caf939d80ca99
font_01_sfnt_off00014741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14741 11980 bytes
SHA-256: 2e821c5548dfafa823bd685707427bc838e40aa801f03eb49c5d456693b328b0
font_02_sfnt_off0001700a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1700A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176