Malicious PDF — malware analysis report

Static analysis result for SHA-256 022e4a17a2cad2a6…

MALICIOUS

PDF

85.5 KB Created: 2021-04-04 01:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5c7eaee9bb1d04451cf8cc5f4a65068e SHA-1: d2f7d6897d0e6747c865111bca10e09f326a8580 SHA-256: 022e4a17a2cad2a68ac22162a6f38a2bbe70451e7b7b6975ae90eb4a8605aa78
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs and the document's structure suggest it's part of a phishing or malware distribution scheme, likely using the document content as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=codigo+de+etica+del+trabajo+social+en+colombia PDF link annotation
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/zowuvudiwu_jazefeje_vosotuzok.pdfIn PDF document text
    • https://gitexapovaje.weebly.com/uploads/1/3/4/4/134464395/4304071.pdfIn PDF document text
    • http://fuvidevifa.scienceontheweb.net/autism_spectrum_disorder_symptoms.pdfIn PDF document text
    • http://wudazex.sportsontheweb.net/dog_symbolism_in_wuthering_heights.pdfIn PDF document text
    • http://baboguzaxeleju.mypressonline.com/99263207573.pdfIn PDF document text
    • https://ludefojixik.weebly.com/uploads/1/3/5/3/135347049/41b7e29b2e6.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/1c3ecebe-5f5e-4ff5-aa11-68f48b3433a3/5569473292.pdfIn PDF document text
    • https://00f02ae0-031c-4cf4-85c3-86bbc6d7deb2.filesusr.com/ugd/13f2e4_7fd8ecb5cfdb4380b3f536fffaa7bf44.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b09f14-3dc9-4765-b32a-18da3de5094f/69389581203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd5e2cdf-18be-4ebe-bbf1-a3fbadc69e88/we_the_animals_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec83bc9-4126-4c5c-951e-47e2c91e6c4b/a_world_of_ideas_essential_readings_for_college_writers.pdfIn PDF document text
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_24332114857b4a47b879f626ece56168.pdf?index=trueIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_80d01f62e7734f9f9216f4af7a862117.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_39629aee837c4b78806d4de871b9def6.pdf?index=trueIn PDF document text
    • https://a3abd3d7-f7e4-4b0c-86b7-ec358d8c805a.filesusr.com/ugd/97a3b3_01140af9bdd942c096a07de88c56468c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd099ca8-7c3e-4ed1-a7f5-9244ac406eb7/72313095539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/979faa0a-77f3-4b4a-a860-02b409902217/epson_wf-3640_printer_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc4653a-3920-4523-8bb1-9b4b880d9a1c/what_is_average_household_income_in_toronto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f0d223-bf13-44a5-9836-b4b4da183a87/how_to_change_grease_in_kitchenaid_mixer.pdfIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_f876536d25664bc1aaa04639b676df1a.pdf?index=trueIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_7eab647f4d9d41fa86fb101866e750bb.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_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 5380 bytes
SHA-256: 25b792e3e48f2331f40cddd7e7c5cc8cb48b7a97be785fae6b9b46867c4b1bba
font_01_sfnt_off00011f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 12164 bytes
SHA-256: 7d198272690afdd43f9d2c120d24b47fdda81dabd39b8ef71fbe788f267673c4

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