Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92dc4d6749a94fc…

MALICIOUS

PDF

115.6 KB Created: 2021-03-24 11:06:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 74b2d3ee94d249b1151f3318667286f9 SHA-1: f311727b79ad6663f0c3e21e4eb4bbb2a3e8d744 SHA-256: e92dc4d6749a94fc4526fd6460e8443464e150615fa9721d107d683b024d0f91
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious websites. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/award?keyword=alphabet+international+alpha+bravo+pdf PDF link annotation
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/jeluvero_dakezawuvavaso_wokononofuwil.pdfIn PDF document text
    • https://tewafegode.weebly.com/uploads/1/3/5/3/135350941/firulezepuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487186/normal_60329abdedb98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_6022da7813f2b.pdfIn PDF document text
    • https://ranadelogixapik.weebly.com/uploads/1/3/4/4/134483714/1790554.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/bb67852e-6f61-4fbe-bf82-3c2a42eeea8b/how_to_clean_my_keurig_k_cafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd05d914-3a7d-42f5-839e-dd897a1ea2e6/46412452182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/636307e8-8c70-46ed-8d70-31099470ac40/mipulefekilivaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a3b1f00-90e5-4a4e-b91a-59f2526356da/gunozokok.pdfIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_9ecba782a53640fa98952b1e5dd03325.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af96e76f-25d0-426e-9352-0f325e965b45/4432604738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90a794ed-97f1-4c7d-9ce1-006bb17827dc/soccer_training_fitness_drills.pdfIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_800634c0a72d4a6da362086bf8b82629.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/action_blaster_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3db743-2ef8-4c94-8ed4-dd47571ee083/how_to_clean_uppababy_vista_rumble_seat.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/what_are_the_types_of_dachshunds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/999c84ee-c8b1-478e-9799-3ad077dd0077/gisomerij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3741ad5b-ddf0-4f2f-b1bb-01c89ddfe499/form_and_space_architects_hyderabad.pdfIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_8a77a62e4f2648cc8c1c7b72195b23f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/dolphins_vs_browns_injury_report.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/how_to_get_a_certified_copy.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A09 5140 bytes
SHA-256: c7ce3a6c5ff88db0e06010254070baf1fd3232d4ab3993fc84821df3a6b7fd94
font_01_sfnt_off00017b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B82 15724 bytes
SHA-256: 4d7074b61f26d31b7e55b106272d17f436063feacc908b3682cf4b8e77d740b6
font_02_sfnt_off0001ab51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB51 16116 bytes
SHA-256: ba9b5293d46f42e597c092e757bf770b0226661663f119891d806c1875324a0c

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