Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9149da122cb890…

MALICIOUS

PDF

80.3 KB Created: 2021-04-24 18:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9110aaa58e752c050eec6c88d19d1eb5 SHA-1: 643c6aefa313f86435a53fc29afa0d34d94a01ae SHA-256: 4a9149da122cb89087560ca31b31c1d2308a61c6c4054716326ed983bc061dda
164 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 Weebly-hosted PDFs, suggesting a link farm or a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a malicious workflow designed to trick users into downloading further payloads.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/strik?utm_term=line+6+ux2+windows+10
    • https://dujibirarikow.weebly.com/uploads/1/3/4/3/134321406/0e5e54e3d.pdf
    • http://zonuvak.medianewsonline.com/rufodebiwojapodutarelasa.pdf
    • https://wezalowesugalu.weebly.com/uploads/1/3/2/8/132815960/10b0901.pdf
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/9476097.pdf
    • https://wulukisogexoz.weebly.com/uploads/1/3/1/4/131438059/7404649.pdf
    • https://luludexo.weebly.com/uploads/1/3/5/3/135322363/wulufolux.pdf
    • https://sipadaguw.weebly.com/uploads/1/3/4/3/134322090/wavajim-fadimade-titovuna-dibuniram.pdf
    • https://fefefilax.weebly.com/uploads/1/3/2/7/132712664/famevu_jonojajulekaxor_sugud_xuvag.pdf
    • https://dinomorozowi.weebly.com/uploads/1/3/4/6/134610364/nogeji.pdf
    • http://tufuwavaziga.mygamesonline.org/lepijozosi.pdf
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/wiwegorisepovepebewa.pdf
    • https://teroxomiguwadi.weebly.com/uploads/1/3/1/3/131380052/bejados-tokakififomo.pdf
    • http://wejuzofibab.medianewsonline.com/balalovamizuzanilozo.pdf
    • https://bimuwosexiwo.weebly.com/uploads/1/3/1/1/131164043/4c0363f6b.pdf
    • https://benevegavevu.weebly.com/uploads/1/3/4/5/134501748/xejejulisaliku.pdf
    • https://dobojadu.weebly.com/uploads/1/3/2/7/132711966/togaxivora.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lodazojamuva/how_to_reset_kenworth_t680.pdf
    • https://56352102-112a-4456-a677-0775450c4ed3.filesusr.com/ugd/ed4e87_269aefd3f57a4f189ef47371f828ef6d.pdf?index=true
    • https://s3.amazonaws.com/vanatul/dd_players_handbook_barnes_and_noble.pdf
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_61028032fbb34ac2b8c797c84ed871e3.pdf?index=true
    • https://78636f1b-f2d6-4e4a-b4e1-07eac4c165d1.filesusr.com/ugd/434c97_60bc8b687a7f4dbdb3e00cbfc950ec91.pdf?index=true
    • http://faleferesevo.onlinewebshop.net/64198167905.pdf
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_52935e5348244c48a61bddd49a43b1b0.pdf?index=true
    • https://11210a16-d5d1-4e17-93a3-27fbbb12f21b.filesusr.com/ugd/fb658e_dcd5693b054240ce9415ff54ec5f1b6f.pdf?index=true
    • 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_off0000fc7c.bin
15ab60b890385fee2e90120682e5f75365a22dc1d6175c978d4f92b76c801451		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7C 5064 bytes
font_01_sfnt_off00010df1.bin
b1ad66972cea19a73af04da520c194b4d518d6436d2af08928c98cd96676118c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 11132 bytes

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