Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d94704960168ec…

MALICIOUS

PDF

76.2 KB Created: 2021-06-02 12:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b01c9574d3ebb345181d32734212b50 SHA-1: e6a80c17aae0cdd8c21d5b424bb348525a7963da SHA-256: 44d94704960168ecb1b51baf2f24e23179d59390c2736636ad13e3bfd813412e
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to 'infrive.ru' and framed as a Roku remote reset query. Heuristics indicate this PDF is part of a link farm hosted on disposable domains, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious, suggesting it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7376

Heuristics 4

  • 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 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
  • 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://infrive.ru/pbw?utm_term=how+do+i+reset+my+roku+stick+remote
    • https://static.s123-cdn-static.com/uploads/4476275/normal_600916c041c40.pdf
    • https://cdn-cms.f-static.net/uploads/4450731/normal_6031754937f27.pdf
    • https://static.s123-cdn-static.com/uploads/4375203/normal_5ff40ae2979b0.pdf
    • https://vejarava.weebly.com/uploads/1/3/1/0/131070596/6d1d08cbfdcc9.pdf
    • https://zuwasaroniw.weebly.com/uploads/1/3/1/3/131380739/kalolibizetaf_zizafetu_sajepes.pdf
    • https://dunijolojuk.weebly.com/uploads/1/3/1/4/131437931/newegefijegi.pdf
    • https://cdn-cms.f-static.net/uploads/4381539/normal_605f3ca5a036a.pdf
    • https://nuwuzeparagagux.weebly.com/uploads/1/3/4/8/134883197/zerakavaso-nanerokeladen.pdf
    • https://static.s123-cdn-static.com/uploads/4366055/normal_5fde089261361.pdf
    • https://pojosividadom.weebly.com/uploads/1/3/4/5/134524524/zuzined_furar_berudilokubit.pdf
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/veziledijev.pdf
    • https://xefezabegeritaj.weebly.com/uploads/1/3/1/3/131379478/ziteki_zurajedeveg_walojape.pdf
    • https://xusuzipurojovup.weebly.com/uploads/1/3/4/3/134325257/lorazapibevimep-fixiwikalagore-dusuvuxezix-xugozota.pdf
    • https://cdn-cms.f-static.net/uploads/4412170/normal_60399cda0bf34.pdf
    • https://static.s123-cdn-static.com/uploads/4379615/normal_6003f95293de8.pdf
    • https://cdn-cms.f-static.net/uploads/4450519/normal_6027ec82871f6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://werinenimuta.pbworks.com/f/xexeluxalumu.pdf
    • http://xugilip.pbworks.com/w/file/fetch/144501231/47820069986.pdf
    • http://wixugigir.pbworks.com/w/file/fetch/144457386/kesler_science_halloween_escape_room_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/4e8a7d04-dd99-4ff7-a4d4-8c1b7f02ba7e/referencias_bibliogrficas_formato_apa_ejemplos.pdf
    • https://uploads.strikinglycdn.com/files/0d1d976c-fcab-40c7-9b07-448bf6b24a85/bojemi.pdf
    • https://uploads.strikinglycdn.com/files/986efc92-8596-447e-8019-548e694a71c8/sub_zero_wine_fridge_cost.pdf
    • https://uploads.strikinglycdn.com/files/9b9416e7-6a21-4202-a8f2-360de55ab7e8/marlin_model_60_boyds_stock.pdf
    • http://pamotekegopa.pbworks.com/w/file/fetch/144439689/64179152009.pdf
    • http://polubisoxuwo.pbworks.com/w/file/fetch/144496077/nitev.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef04.bin
1d61b46328d4758c767aa5c76d019d848b3598294660d878dda2576d06eb595a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 4840 bytes
font_01_sfnt_off0000ff97.bin
42b0ad8f28ee9aaca22f58dd8e00c1d00be008753b0dd9195168a2928cc75e1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 11104 bytes
font_02_sfnt_off000124db.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 4324 bytes

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