Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a07a147ff56cc77…

MALICIOUS

PDF

73.6 KB Created: 2021-03-15 15:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 992446d4bd6938daa4fa694595ef36a2 SHA-1: 2451b6041629e554a12047171210b6564abeca3e SHA-256: 0a07a147ff56cc77c03dcf7f17fd1b54e62b830ac6fb30ff25525ccb2d5d7a56
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure itself is indicative of a malicious SEO tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pelibifir.ru/wix?keyword=best+manual+citrus+press
    • https://nokaxogu.weebly.com/uploads/1/3/4/5/134520383/mazetujoteko_puratutefixugoj_nesutek.pdf
    • https://fubuworarakej.weebly.com/uploads/1/3/4/1/134108970/mutuzonajo.pdf
    • https://static.s123-cdn-static.com/uploads/4407318/normal_5ffe2c579cf13.pdf
    • http://sowoxapexemex.sportsontheweb.net/ge_xl44_manual.pdf
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/nuronufavidila-perirajozi-lusaj.pdf
    • http://vumogegotawugub.mypressonline.com/75753511224.pdf
    • https://lizodeva.weebly.com/uploads/1/3/5/3/135342900/4474836.pdf
    • https://firupafawaxif.weebly.com/uploads/1/3/4/1/134109114/5962817.pdf
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/gevasopezo.pdf
    • https://cdn-cms.f-static.net/uploads/4501385/normal_6045e6430fa78.pdf
    • https://wupixizot.weebly.com/uploads/1/3/5/3/135398135/zuvuk.pdf
    • https://kijujula.weebly.com/uploads/1/3/4/7/134756294/1d0c1ef50a4f.pdf
    • https://zofoxutugutijor.weebly.com/uploads/1/3/0/8/130874595/gukidajeba_bikediberel_kebexazufotaz_kogeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://juludiripo.myartsonline.com/baobab_fruit_benefits.pdf
    • http://xijejuvi.myartsonline.com/brothers_grimm_fairy_tales_book.pdf
    • https://uploads.strikinglycdn.com/files/05b3fef8-2846-45b3-8f6c-ad168a9cb519/mipulawuvodivutujamopurik.pdf
    • https://uploads.strikinglycdn.com/files/308094d2-ca1a-4a72-a54d-0e25a2ac0737/family_tree_with_photos_microsoft_templates.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_off0000e3f3.bin
8aed324947ecaaaead04fc9bf2c918a391a0900c4a6909944ab2447546a7bcbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 5128 bytes
font_01_sfnt_off0000f549.bin
36ceef2def7c635d7b8945af1217d3a59723a2e6160a04ebfd46ee69f6f48c5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 10240 bytes

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