Malicious PDF — malware analysis report

Static analysis result for SHA-256 360785421e57d46c…

MALICIOUS

PDF

80.1 KB Created: 2021-06-08 11:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c43a80d8ed35ade258246fc3dbadf52 SHA-1: a967b99be9066c03f288c76d7c1f6c325a2d6fc1 SHA-256: 360785421e57d46c97d28d04dc6a00c089262aeef85e6a4ca4ab5aefd6a30f51
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URLs, such as 'https://philabc.ru/pbw?utm_term=como+investir+no+mercado+de+a%25C3%25A7%25C3%25B5es+com+pouco+dinheiro', are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://philabc.ru/pbw?utm_term=como+investir+no+mercado+de+a%25C3%25A7%25C3%25B5es+com+pouco+dinheiro
    • https://pejetoli.weebly.com/uploads/1/3/1/4/131454808/6708741.pdf
    • https://cdn-cms.f-static.net/uploads/4420775/normal_602afe17d58e5.pdf
    • https://ginuzakonufa.weebly.com/uploads/1/3/2/6/132681862/bovekobigip.pdf
    • https://dolibaradodusop.weebly.com/uploads/1/3/4/5/134595809/xegoxolivipidi.pdf
    • https://kesegupopu.weebly.com/uploads/1/3/4/1/134131766/rubul.pdf
    • https://nibivesulekot.weebly.com/uploads/1/3/4/0/134017222/c87956b11dd4ba.pdf
    • https://wavupuzubeje.weebly.com/uploads/1/3/4/2/134235525/6315192.pdf
    • https://cdn-cms.f-static.net/uploads/4476122/normal_6029227894100.pdf
    • https://rinejadujasale.weebly.com/uploads/1/3/0/7/130775071/juvarasujef_savogof.pdf
    • https://batagokefo.weebly.com/uploads/1/3/1/0/131070859/lepozosuto.pdf
    • https://static.s123-cdn-static-d.com/uploads/4505687/normal_60b5f4181ee47.pdf
    • https://lonewarole.weebly.com/uploads/1/3/4/5/134593790/mefupawigonaze-vadabobuwejom.pdf
    • https://makurabun.weebly.com/uploads/1/3/4/6/134651698/rilozudaxagojaxelige.pdf
    • https://mefopati.weebly.com/uploads/1/3/4/8/134866381/7df698ae1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/71308c5a-3c42-4885-bfec-92395afcd146/english_to_gujarati_translation_app_free_download.pdf
    • https://uploads.strikinglycdn.com/files/975545e2-1766-4691-8013-3e59bace200f/how_to_become_an_aircraft_mechanic_in_canada.pdf
    • http://tazijebep.pbworks.com/w/file/fetch/144562632/diwafuli.pdf
    • http://gupiguna.pbworks.com/w/file/fetch/144716400/bulewuwosufavos.pdf
    • http://labidan.pbworks.com/f/56858516932.pdf
    • https://uploads.strikinglycdn.com/files/23f165cb-69b9-446c-a623-fd9b2e296f65/the_boy_in_the_striped_pyjamas_cast_2008.pdf
    • https://uploads.strikinglycdn.com/files/586850f4-1032-429c-9cff-8a3d5b7d70f5/rivogonovamif.pdf
    • http://namikikis.pbworks.com/f/sheet-_fed_offset_lithographic_printing_press.pdf
    • http://mivegaz.pbworks.com/f/rijalokevuwejuwa.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_off0000f62f.bin
50f0044c66b7c48ff0b323fa57f3bf640ab7dac1e0e35115ac01942201a1d310		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 5648 bytes
font_01_sfnt_off000108ac.bin
f5a2c249aa0b4096ae41a98014a97e3b5bed089870e7f09153a4db3b536d5a5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 12768 bytes

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