Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e2735db6fd70fc…

MALICIOUS

PDF

84.1 KB Created: 2021-03-19 14:51:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2b023e01e4c1e4a5c0ec6b0d97225966 SHA-1: 21769bde44e53d8fa983568f03b8cd1db96070e9 SHA-256: 85e2735db6fd70fca66c1993147910a7a592cb2efb0385c11963f682f87b2196
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://botokaw.ru/aws?utm_term=pokemon+theta+emerald+walkthrough+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459936/normal_604b6f8930d2b.pdfIn PDF document text
    • https://cdn.sqhk.co/vateviti/5KjcEgh/xaporawelopawukesodexefu.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/ijghhd3/snake_vs_block_skins_unlocked.pdfIn PDF document text
    • https://tegidaweriwasul.weebly.com/uploads/1/3/1/4/131483440/891103e2392e.pdfIn PDF document text
    • https://sesubovokur.weebly.com/uploads/1/3/4/3/134311777/02eeb.pdfIn PDF document text
    • http://fsbsiod.com/what_ink_does_hp_officejet_5740_usecua10.pdfIn PDF document text
    • https://miwawedunosojoz.weebly.com/uploads/1/3/1/6/131606480/9ad2d.pdfIn PDF document text
    • http://natural-shop.info/how_to_backup_wordpress_website_manually2xb93.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/71103761844do667.pdfIn PDF document text
    • http://national-verifyteam.com/spider_frog_song08b5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496571/normal_60333165b1283.pdfIn PDF document text
    • https://cdn.sqhk.co/voravaxa/ulhhhvL/hangout_pakistan_meaning_in_urdu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464315/normal_5ff7cf288a25a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463005/normal_6005f0913b10e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425010/normal_5fefb515d13b3.pdfIn PDF document text
    • https://cdn.sqhk.co/beratinuga/hyBiiid/mebefipugariju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_ae5165fd87da4003a3652514f6596277.pdf?index=trueIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_8ca8650e2e4c46278a420dea491733c7.pdf?index=trueIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_26e4a75a6c3a41cda898018bad7abc24.pdf?index=trueIn PDF document text
    • https://5c9c3928-af7d-4195-9e43-9647d7263c15.filesusr.com/ugd/508998_ade0b61eac064ebda9ec353283669fb7.pdf?index=trueIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_7fd55994c8ba43c7965636aa4cdfddc7.pdf?index=trueIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_ee45de59676b4fa588c6d0221b7b56a3.pdf?index=trueIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_78d6f142e2d54ec3b0bde5698ec12a57.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F7 2952 bytes
SHA-256: e211f2d6e0d1bf1fd17bd5150bc2724fb7c0f1d37b1c69b855d9dcad8de34ab0
font_01_sfnt_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 5216 bytes
SHA-256: f2bc76f00b357c454b362773fc249ba0c1b10714efdf0e0024811373523357f5
font_02_sfnt_off00011630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11630 13148 bytes
SHA-256: ef934d5dfec5cca8abcd84e11da0cc63824bf77597cb70424caf016679d7818c

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