Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d5af97c7b74cb7…

MALICIOUS

PDF

67.6 KB Created: 2021-04-02 19:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2952096be0e6987f854650546d41335 SHA-1: cedff46238c9fe7700ecbd500c76b23577562a8c SHA-256: 59d5af97c7b74cb77c8ce5c0b761d21f64d32c8c40a711054117e0d9e776f6f6
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=mama+ringtones+telugu+download
    • https://jukosixosibi.weebly.com/uploads/1/3/1/8/131871462/zudug_xoronunogile.pdf
    • https://lefawiput.weebly.com/uploads/1/3/5/3/135324435/6383298.pdf
    • http://mareson.getenjoyment.net/85712603395.pdf
    • https://tepukijamuboze.weebly.com/uploads/1/3/5/3/135301813/aad382e4fbc85a.pdf
    • https://tazirive.weebly.com/uploads/1/3/0/9/130969887/jaxodok_gamifi_bakewaxozat_karujufuz.pdf
    • http://lonotel.mygamesonline.org/la_rebelin_de_la_granja_pelcula_completa_george_orwell.pdf
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/2605847.pdf
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/ed2a4e2.pdf
    • https://bejokezogakuji.weebly.com/uploads/1/3/2/6/132695802/3c682.pdf
    • http://dimupure.22web.org/pencil_drawing_for_beginners.pdf
    • http://axecheat6.xyz/67986542628l2oen.pdf
    • http://xafesuvorolivig.scienceontheweb.net/xazexito.pdf
    • http://jolovomolosubi.getenjoyment.net/23725208864.pdf
    • http://luxisulejoxo.getenjoyment.net/vepofolowiwudad.pdf
    • http://ctuxuu.com/43881148120vae8l.pdf
    • https://dunevija.weebly.com/uploads/1/3/4/3/134306837/e5889b379e.pdf
    • http://istlan.space/calories_in_dunkin_donuts_large_iced_caramel_latteq3ys2.pdf
    • http://tezuveripoxub.mypressonline.com/lbs_to_kg_chart.pdf
    • https://kaxutaxi.weebly.com/uploads/1/3/4/3/134387751/32e70.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bovaxibeloxev.rf.gd/9163981555.pdf
    • http://jabelakejirer.epizy.com/mehndi_design_videos_free.pdf
    • http://jewofeket.onlinewebshop.net/78093875929.pdf
    • http://nekaxogide.epizy.com/zujejok.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd01.bin
fce01e3d956d6975f27660b6d5ce7e2639abdda364dc57cd0d2ca6d1b5212d16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD01 5244 bytes
font_01_sfnt_off0000ded8.bin
a92964db70454183212c09a0109910d0fe40560c9a6b5c4061692d8c7cf04530		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 10072 bytes

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