Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf5742cd77e337d…

MALICIOUS

PDF

88.1 KB Created: 2021-03-21 11:30:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2f702d7886db2678c99a789e2df6ee45 SHA-1: 50bac84d70d6e5bba635d566674647f6d4d0ef05 SHA-256: 9bf5742cd77e337d7c8807584a7fc303a83f9a22cbaeacb9355bd4f64aa9fa6f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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/award?keyword=e+bildirge+%25C5%259Fifre+formu+pdf PDF link annotation
    • http://kovatafob.mypressonline.com/41957303489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_601b062109eca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487903/normal_604f2475a8fa0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404740/normal_60000d24ca8da.pdfIn PDF document text
    • http://wekanisa.scienceontheweb.net/7873803405.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/japididezivurinabi.pdfIn PDF document text
    • http://govuxojikasumot.scienceontheweb.net/history_of_english_literature_by_t_singh_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413585/normal_602ae2263af32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414680/normal_602c2013cc882.pdfIn PDF document text
    • http://napowojeba.medianewsonline.com/dizetafopo.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/latojo.pdfIn PDF document text
    • http://lesuxofozadize.mygamesonline.org/advanced_trainer_book.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/sennheiser_g3_or_g4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423752/normal_5ffd473e88a47.pdfIn PDF document text
    • http://kemutedetabu.scienceontheweb.net/nurujalaxumasidiwix.pdfIn PDF document text
    • http://pexawegowe.mywebcommunity.org/law_of_cosines_word_problems_worksheet_with_answers.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
    • http://dufojamimusim.atwebpages.com/ihip_drift_speaker_instructions.pdfIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_30eae89f88174777b208c51f957ecd65.pdf?index=trueIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_865e8d5a06fa4b3a9c7cf3442ad339f0.pdf?index=trueIn PDF document text
    • http://liduvitulugug.onlinewebshop.net/geomorphology_mcq.pdfIn PDF document text
    • http://lelikerakovet.atwebpages.com/start_late_finish_rich_by_david_bach.pdfIn PDF document text
    • http://rabelame.atwebpages.com/42964634486.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_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 5016 bytes
SHA-256: d4cd45dad18c231665e9f641941c6728baaf2dc2606625a10f270629df9a8cca
font_01_sfnt_off00011c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2F 12396 bytes
SHA-256: d27edd3daf949b742714dc703f0d238ec06d8a981d6ea7d853c46363f8d0e875
font_02_sfnt_off00014350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14350 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f