Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c7463abe8ac83e…

MALICIOUS

PDF

79.0 KB Created: 2021-05-23 12:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6098556e953d4f4dca2559fc7acfd3b5 SHA-1: 27279c363d197963974ab5fd115d548b004b1a65 SHA-256: d5c7463abe8ac83ef26ebe646eeffce3439cc4fa58513d1c4ca68c39d0b3d85c
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, containing numerous external URLs, with one prominent URL being `https://jumiwimov.ru/strik?utm_term=marvel+avengers+movies+series`. The presence of many links on disposable hosting suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=marvel+avengers+movies+series PDF link annotation
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/bcdf4a79e0.pdfIn PDF document text
    • https://rafopovuweke.weebly.com/uploads/1/3/2/7/132740485/wimejitewi_suvumusir_venesi.pdfIn PDF document text
    • https://sibojigejediwij.weebly.com/uploads/1/3/4/6/134606131/9820225.pdfIn PDF document text
    • https://limofagis.weebly.com/uploads/1/3/4/6/134640762/4589171.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/joropusofu_nigejekedatog_xowoxojis.pdfIn PDF document text
    • https://rusipamisu.weebly.com/uploads/1/3/4/0/134017355/nubareronijaso.pdfIn PDF document text
    • https://winateminapalem.weebly.com/uploads/1/3/4/0/134041456/jemodapakilarafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454807/normal_5fd973b85d638.pdfIn PDF document text
    • https://vaxurubezinijor.weebly.com/uploads/1/3/4/6/134690270/611ac589.pdfIn PDF document text
    • https://kimuximufa.weebly.com/uploads/1/3/4/1/134132687/96e810e764cf7.pdfIn PDF document text
    • https://gisogademumes.weebly.com/uploads/1/3/1/3/131379615/vupisotami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461751/normal_604a7f386f3d6.pdfIn PDF document text
    • https://lefamadagizid.weebly.com/uploads/1/3/4/7/134704745/rifatewenikorasepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_6017426893476.pdfIn PDF document text
    • https://norudajesopoz.weebly.com/uploads/1/3/4/3/134340776/xegudim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8ab1fa04-3ee9-46f2-878d-8872b43c4401/is_hansel_and_gretel_a_true_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1186fa65-fa73-43d6-bce1-957abc270957/fetixibafisitoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/255d501b-8600-4b28-818e-e41815ffd799/mecanica_dos_solos_e_suas_aplicaes_volume_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/800e99ab-abb1-469e-9e20-06567ec4abac/21596761884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/264cdaeb-7dd7-4514-af84-aa6e2552e446/verifying_trigonometric_identities_edgenuity_quiz_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 4780 bytes
SHA-256: 623e0abf39a7970c2ddbe62643f04507fc0eef4257484ca07127f6d730daaaff
font_01_sfnt_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 11412 bytes
SHA-256: cb4b84712fe492bbe554917aceecece3857c7fe665e940bcee20d6d39068ece3
font_02_sfnt_off00011ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e