Malicious PDF — malware analysis report

Static analysis result for SHA-256 904664fd64e5d438…

MALICIOUS

PDF

100.7 KB Created: 2021-03-24 10:22:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7278e68433b50e8b4a3755b824d70626 SHA-1: e3484f92cd0ba1a2a0621b388cbfee427fb69761 SHA-256: 904664fd64e5d438cc3ac1d75aaabef549b13307d6d93981288ab3b59a9ca2c9
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The document body, though partially corrupted, contains a search query related to social learning theory, which is likely a lure to direct users to malicious or spam content hosted on the numerous extracted URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://golowaki.ru/strik?utm_term=explain+the+social+learning+theory+of+bandura PDF link annotation
    • https://vetazewufa.weebly.com/uploads/1/3/2/8/132814418/vabegemosegalazemiza.pdfIn PDF document text
    • https://cdn.sqhk.co/giravopakiw/xjcNcgi/speed_racing_extended_mod_apk.pdfIn PDF document text
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/fesasunibija-sadulugib-tusidafifu-powatelimejex.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/3280513.pdfIn PDF document text
    • https://dibevoxatatot.weebly.com/uploads/1/3/1/1/131164568/1ad09a374dc8a2.pdfIn PDF document text
    • http://lumogodasekepi.mypressonline.com/86603824675.pdfIn PDF document text
    • http://gepidudida.iblogger.org/62041709309.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/mjgiha9/webtoon_unordinary_episode_1.pdfIn PDF document text
    • https://zodovamerevi.weebly.com/uploads/1/3/4/3/134316438/c0032973aeb.pdfIn PDF document text
    • http://xepomujix.22web.org/dometic_awning_manual_retract.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fcdf2e9-73a4-4363-ab0b-9ff9081cd1ae/kuwemosipoponuvifevegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d03c2db-c608-4259-81bf-0524a697f8ec/dyson_small_ball_vacuum_tools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68214ab4-3bac-4839-b4be-f85facb083c9/list_the_8_stages_of_the_life_cycle_of_a_fern_plant.pdfIn PDF document text
    • http://xopidevuk.rf.gd/marriage_d_amour_piano_sheet_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16998995-e38f-4bbe-866c-4a12ea203948/sonatotatotudakarimufit.pdfIn PDF document text
    • http://mikijanux.atwebpages.com/connect_4_shots_instructions.pdfIn PDF document text
    • http://vebusatoro.atwebpages.com/encyclopedia_of_general_science_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc88c79a-c2fe-47d3-988f-f175d482d091/client_service_representative_resume_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117a9c0a-4322-4b54-9e52-1c353ed37a12/bubif.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_off000149d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D6 5684 bytes
SHA-256: 0b6b835c616898235d905e4a2d4352e31113effe36fb91168ac50abd9827051d
font_01_sfnt_off00015d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D2D 11380 bytes
SHA-256: 3ae568a6756d35b632689789221ffef6dc6b8536a94f2e730062dd117cbd8ff6