Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a5d6dbb0fa8c45…

MALICIOUS

PDF

78.0 KB Created: 2021-03-24 18:50:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e73c4698509ad6928f08c5ce00ed17c9 SHA-1: 696170862c603ffcafe9808b026b91f48e950593 SHA-256: f2a5d6dbb0fa8c45b2070cfabf71780523179b07f4d9332b86b564e06fa9a232
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 pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/strik?utm_term=mod+menu+metal+gear+solid+5+ps3 PDF link annotation
    • http://wrestling-mma.com/8940216309651oxi.pdfIn PDF document text
    • https://jipoditilab.weebly.com/uploads/1/3/1/4/131407274/3773929.pdfIn PDF document text
    • http://bilapak.66ghz.com/xozozuxuvalufof.pdfIn PDF document text
    • http://badge-verification-center.com/rewidogatororud8hs2y.pdfIn PDF document text
    • http://ar-foto.art/86049143874jeww6.pdfIn PDF document text
    • https://zimazegikej.weebly.com/uploads/1/3/4/7/134732290/5640478.pdfIn PDF document text
    • https://jisogixisizula.weebly.com/uploads/1/3/4/3/134328009/lozoris.pdfIn PDF document text
    • http://voirly.xyz/hdmi_cable_support_120hz5awen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gomakobez/zubitanile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9408bc0-ef3a-4ead-9cb0-f5b9149d7edf/petsafe_stubborn_dog_collar_tractor_supply.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/carranza_s_clinical_periodontology.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/88886066639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932e1e8d-e5b9-4f6d-ba00-1f7f8e773b25/83775317208.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/pujukape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44497c94-0e71-40db-aab7-f2e4f9a881c5/1_tco_refers_to_the_original_cost_of_purchased_technology_both_hardware_and_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec5625d-637c-4be2-9066-99cd69155083/employees_workforce_synonyms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f52f7373-d3b7-4bfb-a91d-9082f6d1a9f8/dr_berg_what_to_eat_during_intermittent_fasting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01be8412-b850-447c-ae8b-16b7d32e6fad/75420828050.pdfIn PDF document text
    • http://tuzotulerijenej.rf.gd/puzzle_pieces_saint_motel_piano_sheet_music.pdfIn PDF document text
    • http://sivuvupaxiju.rf.gd/strife_specibus_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a091a4f1-9c24-418c-8bb4-889458f9e885/prepositions_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/matlab_windows_shortcuts_on_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edf54ca5-daf0-4577-8c48-db39c857ec8f/guvelex.pdfIn 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_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 2960 bytes
SHA-256: 4c688c0676da4c9c3f1d636d29496b85ed1f90b4285ee9b780884cc7de0e34ac
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 5572 bytes
SHA-256: 7b4dc6f2c916025c497834e5d41a29beb55d8f1c9ffe148c23a053d303319edd
font_02_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 11036 bytes
SHA-256: c1242a1e979f9bdb0c47250d2147994971fbf9d6576c73824683f4dbe5ce4e4b