Malicious PDF — malware analysis report

Static analysis result for SHA-256 08dc31189a505bfb…

MALICIOUS

PDF

74.6 KB Created: 2021-02-18 17:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: df6307395575b8aac77b3c256adaa076 SHA-1: de6b497b57ff6a74b737e97758f3fd4a8b4ef919 SHA-256: 08dc31189a505bfb0d737923b00989cbf553bef2226eaf2ebd42be0132696a0f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or SEO spamming operation. The ML classifier strongly suggests maliciousness. While no scripts were explicitly extracted, the presence of numerous external URIs, including one leading to 'jottigo.ru/strik', suggests an attempt to redirect the user to a malicious site, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://jottigo.ru/strik?utm_term=padi+rescue+diver+exercises PDF link annotation
    • https://gusupaserilobe.weebly.com/uploads/1/3/5/3/135312632/9167035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_601467646fe09.pdfIn PDF document text
    • https://gotizede.weebly.com/uploads/1/3/2/6/132695714/poladidon.pdfIn PDF document text
    • https://leneguvajetuse.weebly.com/uploads/1/3/1/3/131380977/5abfdc355dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450340/normal_5ff119ee7fde8.pdfIn PDF document text
    • https://cdn.sqhk.co/xugumewaz/hggeggg/2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490366/normal_5fccf3eb3565a.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/ftighfz/american_football_rules_quiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421460/normal_60228cbb31cb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412161/normal_5ffc21aeedf6a.pdfIn PDF document text
    • https://cdn.sqhk.co/gupukutolet/hjCjirH/colony_wars_disc_2.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/zuwosil/ap_eamcet_allotment_order_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/red_cross_guidelines_for_giving_blood.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/soroluwanuvijufadapipajob.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/cappuccino_song_ringtone_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/system_administrator_job_description_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/waguv.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/ezogelin_halk_eitim_merkezi_kurs_bavuru_formu.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/tefupawolatafebikik.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/4148121241.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BB 5028 bytes
SHA-256: fc605685ff29f33d52e3e70019a5021147ec680dd19f948ec10373f165423b71
font_01_sfnt_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 12988 bytes
SHA-256: 90c041be37a79c9678ce2343ba5c83bf5894c6f9d0950c787e689ec54a1389e0

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