Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d61096e14a1a48…

MALICIOUS

PDF

76.5 KB Created: 2021-03-24 02:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: af2f21a698e55945538c60254eca24cc SHA-1: ca3c3f9a370567d0968f675b85a457ee9a7cc524 SHA-256: 42d61096e14a1a488890214ca35f4b1c6437b93c57c8f37aafe2fe805834a89d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The embedded URLs and the document body, which appears to be garbled text related to search terms, further support the idea that this document is part of a phishing or malware distribution scheme.

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://lozipotod.ru/123?utm_term=because+of+winn+dixie+book+pdf+free PDF link annotation
    • http://caterm.ru/410989531898cnhm.pdfIn PDF document text
    • http://sedouche.xyz/53923326860f4943.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a961336-31cf-430a-ba64-13db7a308412/59313541351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b1e9d02-4b70-4d4e-b00a-d5746aa34cbb/is_word_or_excel_better_for_flowcharts.pdfIn PDF document text
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_d832790c1f484b9aaab8058861ac38bd.pdf?index=trueIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_d939374878b84126b5c5e9d8fca10efe.pdf?index=trueIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_c676137ae79149b594b4befcb6f73a13.pdf?index=trueIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_c65c9a8c68e145718c52192bbb805d04.pdf?index=trueIn PDF document text
    • http://bokubipojofoji.rf.gd/mht_cet_2019_form_date.pdfIn PDF document text
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_1e47a95f290a4d2b9f7fab65abcb40a9.pdf?index=trueIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_9b57d6e7ede940218e107564c2a6af73.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a467459-526e-4ab0-a84c-48aeeb2136c4/zawuwofopuvadegaz.pdfIn PDF document text
    • http://jolasesiv.epizy.com/types_of_agricultural_marketing_information_systems.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_d73fda9c1c664b3cba3eba214f11edf3.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_e3924a1b98554e399be272ad8e3b5581.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de00a546-d053-4e78-8e11-9baf47fe4424/three_phase_transformer_fault_current_calculation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34c749c0-672d-4620-a7f9-4908eb1f1e20/xopalaxiruro.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_a3bec39690ff4b8fa0134412f2895ed6.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_04a015f8f0414cac8a26d3fd73c73eb1.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_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 5528 bytes
SHA-256: e7cbdb9af5163b01e97d8bd734c7beaa30b6a998c146fcbfea788376427805c3
font_01_sfnt_off0000ff4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4B 10988 bytes
SHA-256: 426dd9e04979d32437cb458660a31c24fafbf9ae8c67612843266f264c69ccba