Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7d49e83f4c1bd1…

MALICIOUS

PDF

71.9 KB Created: 2021-05-08 04:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fc5b0a35050e60296181b944dcb1ecf2 SHA-1: a2c01db3f4be1ef3cc7babbafd291106d2ebdd70 SHA-256: cd7d49e83f4c1bd19601ddba8dbdbd9c9b86b643ef503fc094ee582ddb564b46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external URLs suggests an attempt to redirect users to potentially harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://jottigo.ru/strik?utm_term=mackie+mixer+2404vlz4+manual PDF link annotation
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/2924079.pdfIn PDF document text
    • http://jofijuke.22web.org/hollywood_reporter_newsletter.pdfIn PDF document text
    • https://cdn.sqhk.co/zesozote/ghbKgfl/order_of_battle_world_war_2_cheat.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/hNghnhb/zaradumitepojexev.pdfIn PDF document text
    • http://wevoselaxoto.66ghz.com/granny_outwitt_mod_apk_1._7.pdfIn PDF document text
    • https://wumaluko.weebly.com/uploads/1/3/4/7/134716396/626221.pdfIn PDF document text
    • http://sodazetibup.iblogger.org/vexenipalazizawukadezotob.pdfIn PDF document text
    • http://xukilutu.22web.org/novena_navidea_tradicional_colombiana.pdfIn PDF document text
    • https://cdn.sqhk.co/tumozaraf/WKQjdgc/86795791783.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/A8Fergd/byju_s_early_learn_app_online.pdfIn PDF document text
    • http://tavegumata.sportsontheweb.net/sir_arthur_conan_doyle_books.pdfIn PDF document text
    • https://cdn.sqhk.co/lewuravasu/FSjfigA/hit_the_roof_speed_gang_traduction_francais.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/hgpibjf/stickman_backflip_killer_4_pc.pdfIn PDF document text
    • http://pobesegu.scienceontheweb.net/xumef.pdfIn PDF document text
    • https://miniroworopan.weebly.com/uploads/1/3/4/4/134444940/3ca45.pdfIn PDF document text
    • https://gugekomu.weebly.com/uploads/1/3/0/9/130969097/pezagiroluguvisutal.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/hceW1qK/hot_deals_hotels_in_lebanon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://janarisugikev.rf.gd/50845635877.pdfIn PDF document text
    • http://mofibukuzoke.rf.gd/futezekisijinejuzimol.pdfIn PDF document text
    • http://xetumerim.rf.gd/gisiwajefefivoxuvagevobof.pdfIn PDF document text
    • http://patuwab.epizy.com/contaminacion_atmosferica_peru.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_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 5376 bytes
SHA-256: a9032be1b4e2122d68528b62281695334730a8539e64e22845d2e4d13acef459
font_01_sfnt_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 11528 bytes
SHA-256: 3383824364f448bde415b817fccd1581253e025e6bfad26da39d1d2b7f6bb4b3

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