Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c94a76e5973b6b9…

MALICIOUS

PDF

75.2 KB Created: 2021-03-15 16:13:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31910c8ba48669a528645f0d4681b636 SHA-1: 1a1af1692a515fa4ef7435cfe4d60cc41a77981b SHA-256: 1c94a76e5973b6b97380a39ed563c88ab14f65f757d1b62586cf8e4327eb13c1
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://maypoin.ru/award?keyword=v+shred+endomorph+diet+plan+pdf', is presented in a context that mimics search results for diet plans. While no scripts were directly extracted, the PDF structure and the high number of external links, some pointing to potentially malicious or disposable hosting, indicate an attempt to redirect users to malicious content, likely phishing or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/award?keyword=v+shred+endomorph+diet+plan+pdf
    • https://static.s123-cdn-static.com/uploads/4387244/normal_5fe2be696d614.pdf
    • https://cdn-cms.f-static.net/uploads/4367680/normal_60133dd01c6a4.pdf
    • http://xugafigipi.22web.org/2523850706.pdf
    • https://static.s123-cdn-static.com/uploads/4529095/normal_5ff9bddc4e71b.pdf
    • https://cdn-cms.f-static.net/uploads/4499622/normal_5fd199ab6d91b.pdf
    • http://dasezin.getenjoyment.net/62733172257.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fujunaxukipasin.rf.gd/ibm_i2_analyst_s_notebook.pdf
    • https://451cdc1f-766e-44a1-8a9d-f9db2ecad5ed.filesusr.com/ugd/0f0d48_076be18a8cde4dfeb269689130b93d95.pdf?index=true
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_c88d6dd6cec04f3299b96e2c7d1288b0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b2ab00e5-4ad1-467d-aa66-7a650ea3f39f/31772508172.pdf
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_e475141c10df4e55a0399db364d9a5c5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f07f62d3-add0-4f67-8834-35164b9e11bd/simcity_4_deluxe_edition_guide.pdf
    • http://patudesaruvob.atwebpages.com/22480273667.pdf
    • http://zekipiwozuse.epizy.com/the_twelve_traditions_of_aa_can_be_summarized_as_follows.pdf
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_47c0ff18f6c24910a8167d0a8d1a504b.pdf?index=true
    • http://jajowisomipuw.epizy.com/all_dark_souls_bosses_in_order.pdf
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_872d2f030cba4da48c1d473b5d83a2f9.pdf?index=true
    • http://vawerudarasikow.myartsonline.com/suresevonusenobiz.pdf
    • https://uploads.strikinglycdn.com/files/d38e9f44-eb7e-4947-982a-e86bf50d44b9/85575070426.pdf
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_a6437eda4cd8453f87b5820acc3b5dd7.pdf?index=true
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_29c09e0d48b54b5cad71ac03c4ac1118.pdf?index=true
    • http://benepuru.epizy.com/jobukevumaxepobofezo.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_off0000e9a3.bin
73edcc6b756821a3a60585976ef41f2fb69cdb498d40e6fbbff5381ade81a9f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 5244 bytes
font_01_sfnt_off0000fb4f.bin
4681e1d03ac1b628d7970271662ba163c3ad71ec31e9d6b9930f7f093d24a654		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4F 10812 bytes

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