Malicious PDF — malware analysis report

Static analysis result for SHA-256 3116c44e216a8bb1…

MALICIOUS

PDF

87.3 KB Created: 2021-04-02 21:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9430c12026bb0f7ca134cff1265efa6c SHA-1: 25d15ecc99ba2b13bd0513eff8b3508b7c83521c SHA-256: 3116c44e216a8bb1cbef983627a872e1815a0e3ad7c5b0969d0ead908db8372c
184 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with several heuristics flagging it as a malicious redirector and link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the embedded links, particularly the one to 'yafferge.ru', are the primary indicators of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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://yafferge.ru/123?utm_term=italy+travel+planning+guide In PDF document text
    • https://cdn.sqhk.co/wavagowew/jfPgfGO/59029453511.pdfIn PDF document text
    • http://stavki.link/how_to_program_universal_remote_lm-1079vrqhj.pdfIn PDF document text
    • https://cdn.sqhk.co/mezomabesoki/gdgdOjj/dirt_bike_racing_offroad_racing_games.pdfIn PDF document text
    • http://fekowepiz.mywebcommunity.org/beachbody_21_day_fix_calendar.pdfIn PDF document text
    • http://tixanijematewe.mypressonline.com/cytological_fixatives.pdfIn PDF document text
    • http://sunugukumota.getenjoyment.net/medical_abbreviations_uk.pdfIn PDF document text
    • http://closemaze.com/kexisunewasasumomifejaucuo5.pdfIn PDF document text
    • http://scoretdho.best/garmin_nuvi_2555lmt_reviewkde48.pdfIn PDF document text
    • http://xinupavob.iblogger.org/22003000001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450151/normal_6056a743ecea6.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/DigQmde/jodusepasawasoxuvegir.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/Jhcimif/draw._io_templates_network.pdfIn PDF document text
    • https://cdn.sqhk.co/bofilewidil/uFFgggj/college_hockey_apple_tv.pdfIn PDF document text
    • http://kopawaruda.22web.org/dinalasepew.pdfIn PDF document text
    • http://dasaburaxad.22web.org/how_to_sell_a_real_estate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371808/normal_5fce9583a8f98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zoniguzetixan.epizy.com/autodesk_manager_not_working.pdfIn PDF document text
    • http://lexekuduwowig.atwebpages.com/karl_marx_communist_manifesto_malayalam.pdfIn PDF document text
    • http://sapumazolexu.epizy.com/augment_ancient_item_diablo_3_guide.pdfIn PDF document text
    • http://temekem.epizy.com/motorcycle_keihin_carburetor_tuning.pdfIn PDF document text
    • http://xetawirozam.epizy.com/zimudisozeriv.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_off0001181e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 5048 bytes
SHA-256: ba9302169575dbbdddc935174c851a14b8b6d53659069ae3ee67bc76b3f038d3
font_01_sfnt_off0001296a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296A 11240 bytes
SHA-256: 8ec5ccad3c0961d95935ebffdd0d13f8a7686bc6799d4b7ceb36886a3407915e

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