Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a83a0e5a138aa92…

MALICIOUS

PDF

122.8 KB Created: 2021-03-21 04:32:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1bba505c4500abf6c8e24644b4ad9729 SHA-1: 941ffd89021a55527c5730634ca89c8e547f3697 SHA-256: 5a83a0e5a138aa92cd897d0b290ae3eaa11584b14856d81e046c04cf600e34ee
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, with one prominent URL being https://ponafet.ru/award?keyword=islamic+bangla+boi+pdf. The document's structure and the presence of many external links suggest an attempt to manipulate search engine results or distribute further malicious content, potentially via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/award?keyword=islamic+bangla+boi+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461232/normal_60109e3d82bd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394073/normal_5ff1069cd28be.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/FhehgeG/little_horse_running_fast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_5fe8921b20535.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/Qjfnghm/44606850150.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/9ijwEP8/76300831043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409238/normal_5ffa198d5ba9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481841/normal_5ff0e474f2aea.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/dd6a5543-7846-4802-8f5e-9950f7b81099/la_esposa_que_ora_internacional.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_773fde169a834593a681b3550ac6114b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f56ceb0-8ff0-412e-b9a6-bcd728bc84f6/nusuvudiberipelafenugupob.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_d920e87c2a9b4c79acc48151a798c742.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/safago/jbl_flip_5_vs_charge_4_which_is_better.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f3c0106-1b01-4b63-9b84-98d4ba8e70c9/tetatimadosokofemozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecefb14d-96bb-4c1a-88dc-92d97cf72ac3/digesexalelejuze.pdfIn PDF document text
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_f60e59c52f5943dd950d9dc5ced749d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b98a8bb6-b41a-422f-8270-fce915094e04/machine_learning_and_deep_learning_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ef0fb7-97f0-4fea-ba4f-105d3ca25790/chamberlain_liftmaster_professional_garage_door_opener_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/where_to_buy_shop_vac_brand_filters.pdfIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_e8265ce83d3943678fd8e60ade6bacb9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca57250d-7d88-45a0-ae8a-3e7eee84b5bc/16096523906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dee7b584-5426-4b87-9164-40e287a42ac6/2018_subaru_forester_xt_touring_price.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_cde1930266914e16a1084ec23fc4ee5c.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000189f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189F9 5456 bytes
SHA-256: 5c869223d4e7bfaa872b060de8c3844dbb471fbbca00b787b98c01f2453f1d89
font_01_sfnt_off00019c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C73 7056 bytes
SHA-256: 6f05b59ae695ee42574ad99a9006d2c68d020033ad377e89127a48f6e56dcecb
font_02_sfnt_off0001b37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B37F 12648 bytes
SHA-256: 38df43654918b38ee7b816700e0ec988092fcf572bee91438388cbf2fa0993fe