Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c11f03042082ce…

MALICIOUS

PDF

84.2 KB Created: 2021-02-26 13:22:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6265c63d9d404111fc492f237d90180e SHA-1: a8171d2115fd68e1df90440970a1aa3232740f1f SHA-256: 56c11f03042082ce52168b9cda963101e679f879042170b82d17d0d97b1b5136
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for link redirection or exploitation, aligning with T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/aws?utm_term=la+iliada+resumen+corto+wikipedia PDF link annotation
    • http://experiment.website/zuzavodurunawazikiruwklgro.pdfIn PDF document text
    • https://cdn.sqhk.co/ronobiberagu/ghflSP0/46976455715.pdfIn PDF document text
    • https://kanodofeju.weebly.com/uploads/1/3/5/3/135325650/sijuf_pinabuwuk.pdfIn PDF document text
    • https://bifugojatomawak.weebly.com/uploads/1/3/1/4/131437093/digumabagoro_zuguxivixibopif_zegofu_sutip.pdfIn PDF document text
    • http://dompodklyuch.com/rejujigexibo2f2fq.pdfIn PDF document text
    • https://cdn.sqhk.co/lutadamafe/EHBWjil/hola_music_mic_stand.pdfIn PDF document text
    • https://cdn.sqhk.co/menigopas/EiihjjQ/75402121310.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/dhiXibT/gukesevowubedurowexalun.pdfIn PDF document text
    • https://lavafijaxeb.weebly.com/uploads/1/3/0/7/130740432/91c72d4b912656.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/heijhf2/dwight_howard_fiance_texts.pdfIn PDF document text
    • https://lagomide.weebly.com/uploads/1/3/5/3/135304015/8752617.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/792696.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/Ivheghu/comicstaan_amazon_prime.pdfIn PDF document text
    • https://cdn.sqhk.co/jozunufap/Fhfql0M/tweencraft_cartoon_video_maker_animation_app.pdfIn PDF document text
    • https://cdn.sqhk.co/xenojepezere/1cgfCgg/70541513462.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://s3.amazonaws.com/boduxatavepe/bonudojedogixe.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/fundamento_prueba_de_catalasa.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/instagram_highlight_template_dimensions.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/canon_eos_rebel_t5i_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/guide_classes_wow_classic.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 5196 bytes
SHA-256: 222b08cce1392fe2b0e58ad15172ab0ca408a49fc8a548f98f9f1c4f2b2d69b7
font_01_sfnt_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 11824 bytes
SHA-256: 22a01f4e7826af236fc43d053e74fe8ce486513b57e25b026c354b862a2730bc
font_02_sfnt_off00011dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFB 16144 bytes
SHA-256: 64d7204b7c904b600158d10e0b8dfc2ac39b7db43a904f501a21ebbf7969b576
font_03_sfnt_off000132cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CC 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230