Malicious PDF — malware analysis report

Static analysis result for SHA-256 306487717ae769b9…

MALICIOUS

PDF

71.6 KB Created: 2021-02-24 20:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6ef9a2beb79238349ec4d2c416e62f4b SHA-1: 1eaf91acef7d24dd523d1ccd92551d2d2e580296 SHA-256: 306487717ae769b961e752ce6525b26c65389a5e58adc14fda7571448183bc04
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 0.9997

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
  • 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://leonvi.ru/123?utm_term=how+to+do+tai+chi+at+the+park+on+sims+freeplay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369333/normal_6020aab82d329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486051/normal_603370fa5a525.pdfIn PDF document text
    • https://xaburopufazig.weebly.com/uploads/1/3/6/0/136051881/luvelekadiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460251/normal_6013b192d2f8e.pdfIn PDF document text
    • https://cdn.sqhk.co/vutazekerubu/heR2NyR/taichi_panda_3_dragon_hunter_apk_download.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/nanezewapana_xepap_zovegakem.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/ehdhaah/78154577250.pdfIn PDF document text
    • http://megazoni.iblogger.org/tevikivanux.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/jdchgip/divibifeba.pdfIn PDF document text
    • https://cdn.sqhk.co/somisafeg/bjhiegc/18949289800.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xadamodovupeniz.rf.gd/nikozobawitajuje.pdfIn PDF document text
    • http://lagadasisipas.rf.gd/bapaforimaxagobufedeg.pdfIn PDF document text
    • http://rezekeruj.rf.gd/kalapefimaj.pdfIn PDF document text
    • http://tezuzatarezoz.epizy.com/ace_practice_test.pdfIn PDF document text
    • http://semisoriguregix.epizy.com/who_bring_bible_to_africa.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_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 5612 bytes
SHA-256: 881cd4988d9b985966cc5641ddb5b6ac5a75eef85dcb97d3b51b8055b7efc09b
font_01_sfnt_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 11464 bytes
SHA-256: aa67dc9912b3fd7e4e855a9b629f9484b5fadee7a314875453296d2b1c3d7554