Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b2176c9e2b0230…

MALICIOUS

PDF

87.1 KB Created: 2021-05-27 22:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3aba1886dcf4b3f3d01c1b05b138179b SHA-1: 782be95742bc16d8fdcb8987bffcd96fe85e3555 SHA-256: f8b2176c9e2b02307883332d7b936365e71a2846bdb939de0fee34005db44292
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 Weebly-hosted PDFs, suggesting a link farm or phishing infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://dafemum.ru/strik?utm_term=comparative+essay+template+pdf
    • https://jixevimevulu.weebly.com/uploads/1/3/4/6/134659689/suvuren.pdf
    • https://suzupiba.weebly.com/uploads/1/3/4/5/134507321/2452381.pdf
    • https://mevusaku.weebly.com/uploads/1/3/4/7/134721943/xunufavulupi.pdf
    • https://xawewidijaxiju.weebly.com/uploads/1/3/4/2/134266046/mefutagolawugedinowi.pdf
    • https://befewegumezozem.weebly.com/uploads/1/3/1/4/131453636/tosuzipuna-nuvemazodazopam-zajiwadexami.pdf
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/3878898.pdf
    • https://kaneloko.weebly.com/uploads/1/3/1/4/131408798/1d8d5c6b55a323.pdf
    • https://vusimipemukebev.weebly.com/uploads/1/3/0/8/130814393/8b1f7160512e711.pdf
    • https://sibiwowimi.weebly.com/uploads/1/3/4/8/134868192/2722508.pdf
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/zifozulosonifuvuzuge.pdf
    • https://kimimidinom.weebly.com/uploads/1/3/1/4/131453749/juguvimodixijuz-kugogusasima-mubariga.pdf
    • https://kikosubulu.weebly.com/uploads/1/3/4/8/134884397/zekidusaze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d0c65c4f-bd84-4d8c-8639-3c32a64e948c/how_to_reset_the_badger_garbage_disposal.pdf
    • https://uploads.strikinglycdn.com/files/f2e3e236-5a57-444e-8d2e-fa026514b882/7.3_powerstroke_fuel_system_diagram.pdf
    • https://uploads.strikinglycdn.com/files/93e1a8d1-77b5-4da4-b5c8-25f2ef57a749/numosogefemusapomarumib.pdf
    • https://uploads.strikinglycdn.com/files/54d9c377-adec-411d-9b6d-21f70161b134/me_after_you_paul_kim_ost.pdf
    • https://uploads.strikinglycdn.com/files/8c44dc66-0921-4d1f-958d-a38a5b65c5da/64494836297.pdf
    • https://uploads.strikinglycdn.com/files/a842a73b-3180-448a-9809-a703864205a0/how_to_do_3_day_potty_training.pdf
    • https://uploads.strikinglycdn.com/files/5b55451e-d895-4431-8810-bc90d737ee01/le_pluriel_des_noms_en_al_ail_ou_eu_ce2.pdf
    • https://uploads.strikinglycdn.com/files/7d6b64d9-b179-4e67-9c22-9f7cda413b62/how_to_setup_my_harmony_650_remote.pdf
    • https://uploads.strikinglycdn.com/files/754ce304-ce17-4ac4-999e-edb7a2213659/bikatimopadilenidagaxu.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_off00011919.bin
67c2b35cebaf15e1fe752d88865eee2ae8fddd224f46a29ba0f5bf6ab40b2188		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11919 5252 bytes
font_01_sfnt_off00012ae6.bin
a47ce373072d522f1a7ed85d37484ed02c0798cf744f512c194bc80885a74cf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE6 10604 bytes

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