Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5baa41746ce6f4…

MALICIOUS

PDF

71.4 KB Created: 2021-02-07 12:39:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e03186641c8068f4d71b3309bc623f95 SHA-1: d80cd91160b9575eb50f43e5c785dc3c7c1e2884 SHA-256: ac5baa41746ce6f4e9c84dc60069f96bfadb095fe3403bed50e9bd05d44a9862
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other domains, suggesting a link farm or redirection infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for initial access via spearphishing attachments, likely leading to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://maypoin.ru/123?utm_term=how+to+purl+stitch PDF link annotation
    • https://cdn.sqhk.co/vumuwilaj/ji9djge/uefa_champions_league_tv_schedule_tnt.pdfIn PDF document text
    • http://watizizilumu.22web.org/flip_book_template_powerpoint.pdfIn PDF document text
    • https://cdn.sqhk.co/wabasenenem/hajjheR/58512874729.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/gjgifst/blaze_monster_truck_toys.pdfIn PDF document text
    • https://cdn.sqhk.co/xazururoxe/hdgijjd/pibakipazakezasuxazasot.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/3hhivgd/super_mario_world_red_switch_palace_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/igeghiQ/widoxelisamebezujugulu.pdfIn PDF document text
    • http://nenidegelivon.22web.org/taito_bubble_bobble_game_free.pdfIn PDF document text
    • https://zawiwiguxasawum.weebly.com/uploads/1/3/0/7/130739629/mojijawulit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/cryptogenic_organizing_pneumonia_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/94451691515.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/ikea_whirlpool_stove_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/8174839791.pdfIn PDF document text
    • http://figaniver.epizy.com/gorepagovesenedef.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/barnsley_ccg_asthma_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/35078332338.pdfIn PDF document text
    • http://venuxekokufago.rf.gd/angular_form_html_validation.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/29429133369.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_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 4864 bytes
SHA-256: 5b65bf3a30ea496ed4f3095fe61e7c999ef524375d1958a0975156650eb7243f
font_01_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 10168 bytes
SHA-256: 6571b8e94159f09acd20e301276faae9276a28376424bfc28b2119f87857eac4

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