Malicious PDF — malware analysis report

Static analysis result for SHA-256 c793e789f4aeef2e…

MALICIOUS

PDF

74.7 KB Created: 2021-06-06 23:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 411b9c78662f6f2f7331f495e5260410 SHA-1: 42605f0cb3c40dde98bc6a807d4c57d11deb86f0 SHA-256: c793e789f4aeef2eecdd1ffb501e31d8badde5021204a146a6e1f6f0ded67e72
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous external URLs, many hosted on disposable domains, to redirect users. The document body, though heavily obfuscated, suggests a lure related to image resolution, likely to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://chcial.ru/pbw?utm_term=should+i+use+400+or+800+dpi PDF link annotation
    • https://gisoxesasolide.weebly.com/uploads/1/3/4/5/134590405/ff746ff148f03d.pdfIn PDF document text
    • https://xifisipur.weebly.com/uploads/1/3/1/0/131069870/botusiliv-didawumevemiza-voxigadejira-fenizexekapo.pdfIn PDF document text
    • https://guxizipib.weebly.com/uploads/1/3/4/3/134367178/8963d2808306735.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366961/normal_5fcb4a1b5c24a.pdfIn PDF document text
    • https://nizikalod.weebly.com/uploads/1/3/4/6/134605229/72880.pdfIn PDF document text
    • https://mapupuvegov.weebly.com/uploads/1/3/4/7/134712300/jelapawojiduboki.pdfIn PDF document text
    • https://giwedogifuj.weebly.com/uploads/1/3/4/7/134741463/8422996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486965/normal_603b1ed7930f8.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/vugisodav_wudipuduter_notosu.pdfIn PDF document text
    • https://tebemixaziwig.weebly.com/uploads/1/3/4/8/134889210/zovavikefidi-jarujelunugulo-bonaki-zexifaweke.pdfIn PDF document text
    • https://pufujodixig.weebly.com/uploads/1/3/1/4/131438007/zozalekomixoke-lowozo-nufutovudapiv-zapeta.pdfIn PDF document text
    • https://nodopemewave.weebly.com/uploads/1/3/2/6/132682748/4133352.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/6d88e049-2fda-4e93-b391-60b7356b5f8d/how_to_write_a_paper_on_regression_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13ad7f36-1f2c-4788-9a5e-4ee0916875f5/41059686001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e09a4f1-cc58-4699-9581-891afc75c055/2__spotlight__5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1bd46a6-bf69-420e-9c08-998d2315e341/94513050998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1976c911-ac54-4960-a180-41a44658e9a2/eca_international_cost_of_living_report.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_off0000e3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C4 5364 bytes
SHA-256: b61d330c0f13efdd80926778326eb4844292787d50f4714126319932c2b7b766
font_01_sfnt_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 12364 bytes
SHA-256: f347f3f741ac16e7f8d22e36853c17da8ca9a26f9fe791d631b7a112f33189b0

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