Malicious PDF — malware analysis report

Static analysis result for SHA-256 483ec1994f40ebe1…

MALICIOUS

PDF

100.3 KB Created: 2021-03-20 10:48:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f81e688d67a637c1a1d79b268c2f561b SHA-1: 190fe7e9f07700a59640623e07c570e8433c0ae3 SHA-256: 483ec1994f40ebe14565da73a2933d93c5d70c8ccc00114adbff7c601915d0a7
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, indicating a link farm designed to drive traffic to various websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO spam. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=pdf+paradise+lost+book+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420434/normal_5fc5d9536ba0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386073/normal_6006e53d6ac77.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/10410444534.pdfIn PDF document text
    • http://santaparker.store/walmart_hours_near_me_black_friday1la5u.pdfIn PDF document text
    • http://koprovk.xyz/kewijolemurivedujllexf.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/CzHheIY/pefomakutasojukisakiditi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_600d09c2be37d.pdfIn PDF document text
    • http://dirtygirl.fun/bliss_os_x86p2x0o.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/90824229103.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386839/normal_5ff110ce64bf4.pdfIn PDF document text
    • http://small-italy.space/ulala_idle_adventure_best_class_2020t302a.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/ggn2lhc/final_fantasy_vii_remake_gameplay_part_1.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/38370175975.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484990/normal_5ff941865104f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_cc15a57eebc443f3b0a9f55c54d11b46.pdf?index=trueIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_fd26485a17f046e3abad63e22855b5a2.pdf?index=trueIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_eeeb7d129052421fada282ec3115a2c8.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_5be51a040da14d6b93511d6139a80eae.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_d3a0f3d35c8d42b5a5604119971fe23e.pdf?index=trueIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_faa554e944e94ae5a4cdb066fd1832d2.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_6953d39879ec4d2ab382389054e02e74.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC7 5292 bytes
SHA-256: 5b2da54082b491ff65f3a255ef13f126ae369eaea4e5e2513445cb53b54a1b8f
font_01_sfnt_off000160d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D5 10420 bytes
SHA-256: 455fa28ded5e639fc745f41b6c8288d90e02cf2304b2cb9928d0d49eefa3bb9e