Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e9bb676e412993…

MALICIOUS

PDF

80.3 KB Created: 2021-04-08 11:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 533265980890ce8c8f191c98e73b618a SHA-1: ee89c6c1a2c3c32d6f557c64f4c71563439b1cea SHA-256: e6e9bb676e4129932a4e05da8b8af0b63f383fd22479d90d2a74a90f94dbeef1
186 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 disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no explicit script was found, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=kyle+baker+nat+turner+free+pdf PDF link annotation
    • https://cdn.sqhk.co/gebitasixa/ggidrhb/arduino_nano_iot_33_pinout.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/qhh7BcH/fun_coloring_pages_for_3rd_graders.pdfIn PDF document text
    • https://cdn.sqhk.co/zifegowuf/hcROLWI/laxemelesa.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/jijiggc/38538469572.pdfIn PDF document text
    • https://cdn.sqhk.co/lojulifuvuxu/hbVJVge/balloon_slingshot_for_sale_houston.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/Bjj9hbZ/98586269745.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/gOjciiz/island_tribe_3_artifact_locations.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/hekjgoY/battery_operated_tea_lights_walmart.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
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_a5cf2d000eb0419d899e18a197ef187f.pdf?index=trueIn PDF document text
    • https://30fe55a9-f0c7-4aec-9bf5-b9d2225d99a8.filesusr.com/ugd/c4a51e_64913b1de3b94e9d9b9bd28a8afbad96.pdf?index=trueIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_d93a495eb19d4f298af7bbd5a002e588.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokofapig/clam_antivirus_linux.pdfIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_cfcd750d869a4d4ab2222c1dd3ee81ce.pdf?index=trueIn PDF document text
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_c7497a03baf94b9cbf62c518980a108d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/16739286555.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_058bc75060ba4179a269e0e25cc89c1d.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_686962cd5a9241a2882985d2958765f9.pdf?index=trueIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_87816f634ddf4fb097a5c2c021d2c79b.pdf?index=trueIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_1ce79620fdd3442288c1ce6c3a5afe72.pdf?index=trueIn 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_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 4856 bytes
SHA-256: 121530836227d8a63bc62cae49b6f7261623792eefa9dad1360b0aac1b399a8b
font_01_sfnt_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 10928 bytes
SHA-256: 23e68892cab97fa35bcd87b693fabf8b65b639ab14bda4905023e23cc8c42905
font_02_sfnt_off000125d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D2 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f