Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a67b1f3bb1f5598…

MALICIOUS

PDF

79.5 KB Created: 2021-03-16 19:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a25cb190b2438e0671c99190b0635a1f SHA-1: de14213d491d34d39db0e8f8f3c2885d04db589f SHA-256: 7a67b1f3bb1f55987424347233b9e083f9dbf98c00a5de6fe6a52e2c6635b3b9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs, such as 'https://seumenha.ru/123?utm_term=amadeus+reservation+system+training+pdf', are likely part of a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/123?utm_term=amadeus+reservation+system+training+pdf PDF link annotation
    • http://mabobuluka.iblogger.org/craftsman_chainsaw_16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446030/normal_6026625f336a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484821/normal_604db591e849f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448137/normal_5ff9ed6d58666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_5fd33fb8383d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388612/normal_60083e78ace66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_b587148e50ec4b6a8af3707065f6401d.pdf?index=trueIn PDF document text
    • https://ecad98c5-3f79-4b5a-9309-7060426a101e.filesusr.com/ugd/66ec94_c3bc3ac2cfb94559838bc0fead8cf316.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_82ba04dc96c541efb5e8f39985ae851f.pdf?index=trueIn PDF document text
    • https://54c00800-e679-4366-bb5f-6c4fe2fc45d7.filesusr.com/ugd/3bcfef_c0ad464549c14bbd87d230b5855bc681.pdf?index=trueIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_fda90bd9809942398841375370b02a2c.pdf?index=trueIn PDF document text
    • http://rinexevijexaxi.epizy.com/invictus_poem_questions_and_answers.pdfIn PDF document text
    • http://zegemipufe.epizy.com/animation_throwdown_mod_apk_ios.pdfIn PDF document text
    • http://mobejegi.epizy.com/10048091375.pdfIn PDF document text
    • http://fusifovizit.rf.gd/workers_day_images.pdfIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_92e72ddfc7c9466c869bd4482e7e6ca3.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_ed841207b4de4b06aa7d441a66ece099.pdf?index=trueIn PDF document text
    • http://fomariwidodazum.rf.gd/olympus_om2_manual.pdfIn PDF document text
    • http://zujabazu.epizy.com/calligraphy_for_beginners_book.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_8697b4330d7746b5bf363eaa29a2312b.pdf?index=trueIn PDF document text
    • http://deniketeza.rf.gd/xumuxuzowawexel.pdfIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_bec57fd6df8649eba29ccb727a50b675.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_0b4100cfac7f4a2a9ec3a02d3aa0df9b.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_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 5360 bytes
SHA-256: 4144b9e9356606e0bb0c56b9e0531acaaa00d3f2bf5bb875f1e15c1563704e6b
font_01_sfnt_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 10740 bytes
SHA-256: cfc943e7c5b7c53f8e4e1860be203a1270defad786d2001ac4e2bc86c9657de6
font_02_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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