Malicious PDF — malware analysis report

Static analysis result for SHA-256 603450a181e38f92…

MALICIOUS

PDF

77.7 KB Created: 2021-05-05 00:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 16c2b898f9c26a7256610541ca6129f2 SHA-1: 745f78a6155308760c797e044970dfd86c71c7f8 SHA-256: 603450a181e38f920be93d3c276fc63ba9831b7f4e25e5014c2bd7aac854b9e1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or scamming operations. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=casio+protrek+prg+270+battery+replacement PDF link annotation
    • https://cdn.sqhk.co/nezusoxe/039if9p/marketing_mix_example_pepsi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_60438a3a05d82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_603cb8aa44040.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/ijdcjiP/nodokeximaramuxodanixok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501789/normal_5ff63670de78f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_6014ee7ada9a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_40abff5bc5cd4fbd98d11f4aaeed910a.pdf?index=trueIn PDF document text
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_4f9378d170324b37ae42ab7008e0eb51.pdf?index=trueIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_b96645df1690478392f2dfdd688efdf7.pdf?index=trueIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_b2e5d90d237848498750e5089ea8dbc2.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_59265d5523574d2b937f42b352ee3a54.pdf?index=trueIn PDF document text
    • https://86860ce8-2957-478e-97c3-2abddc2d2c3c.filesusr.com/ugd/754ed1_e7524cd43942480f9de2bbd2985f01ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eea4d7b9-f864-4d21-8727-7ea4e2a533dd/74466099606.pdfIn PDF document text
    • https://e108c0fa-8e70-4110-aab7-e0d30777705f.filesusr.com/ugd/d9966b_6cb04a301f044604ac1651e0e21f6fcb.pdf?index=trueIn PDF document text
    • https://c207dc97-0cc9-441e-8caf-a702c1639d46.filesusr.com/ugd/36abe8_76b75f4f26524ae8b07d48f7f33e5476.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_23239a5997914cc2b672600d2933e727.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a745d2-97d7-4eae-ab85-d38673492780/ariens_path_pro_snowblower_manual.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_c90212a15c084d1cabbac6bbe60582f1.pdf?index=trueIn PDF document text
    • https://80cb706b-a9cc-40e6-9cd2-ad5688d6c4a8.filesusr.com/ugd/c84a73_d5c4d9edd07643b797bccc22ef9889b6.pdf?index=trueIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_60d7aa08d9b949969381a777623827ad.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_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 5816 bytes
SHA-256: f47834b6c73c66e63342370cfc2d0af95eb4072a45fcfa1fb0bc52feb06425b3
font_01_sfnt_off0001042d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 10844 bytes
SHA-256: 0da92ec38b0f03db1767a2d996742095e730760c2b48b49455b4c77429e0c298