Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d8bf17284d4ee3…

MALICIOUS

PDF

88.4 KB Created: 2021-03-23 14:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52ca4cf5c388880db7067ef06f87ba12 SHA-1: 6e48aa75c7b208d32cf17a2346ebdc81d4f5e4a2 SHA-256: 04d8bf17284d4ee30efb9a1ada58bf7f5193da249f79983a6384a874c2dd05ce
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, a common tactic for SEO farms or phishing lures. The primary malicious URL identified is jumiwimov.ru, which is likely used to redirect users to further malicious content. The PDF structure and embedded content suggest an attempt to disguise malicious links within a seemingly legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=mccook+public+schools
    • https://cdn-cms.f-static.net/uploads/4465025/normal_6048426d17757.pdf
    • https://static.s123-cdn-static.com/uploads/4365636/normal_60021f3d52813.pdf
    • https://cdn-cms.f-static.net/uploads/4386366/normal_600ab5183c833.pdf
    • http://dosubodanes.mypressonline.com/adsorption_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4427282/normal_6022ad66ef6da.pdf
    • https://cdn-cms.f-static.net/uploads/4485943/normal_60503bd6db772.pdf
    • http://puduvab.sportsontheweb.net/differences_between_business_administration_and_business_management.pdf
    • http://ramuwesitavoz.mywebcommunity.org/business_accounting_terms.pdf
    • http://xikapajami.mypressonline.com/79255841570.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_d3b36643b64d4cc1affe584cbe1ea763.pdf?index=true
    • https://s3.amazonaws.com/lokijuronig/digestive_system_ppt_free.pdf
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_aa92107e5192468eb6ac55af0d322d85.pdf?index=true
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_3edaba2877f94c039f1a1ad09060f5f0.pdf?index=true
    • https://s3.amazonaws.com/nasitevu/test_your_english_vocabulary_in_use_upper-intermediate_chomikuj.pdf
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_89a9314f621b458bb7e536bded84a009.pdf?index=true
    • http://gamelaluwer.myartsonline.com/asme_bolt_torque_chart.pdf
    • https://s3.amazonaws.com/sukobogixe/final_fantasy_8_card_guide.pdf
    • https://s3.amazonaws.com/zusevamasor/discombobulate_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/273ab910-3a84-4fb3-9a1c-9c0b8d76ed2f/41337868579.pdf
    • https://uploads.strikinglycdn.com/files/d97c0b46-05ac-409e-9004-e83ec1fdf970/john_deere_110_tlb_parts_catalog.pdf
    • https://s3.amazonaws.com/jumedemimo/fikesovajetexizidovago.pdf
    • https://s3.amazonaws.com/sewamos/romeo_and_juliet_analysis_balcony_scene.pdf
    • https://s3.amazonaws.com/zakunafu/23912701169.pdf
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_072271b0aae94687843bc85271331424.pdf?index=true
    • https://uploads.strikinglycdn.com/files/94fba96d-7bab-4189-9dea-e68a59cb7dfd/easy_way_to_learn_organic_chemistry_class_12.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c81.bin
7c85ac1ca70f8557a067e53a560a688f2cc92e0b6c1f09c95c52b97fd6ee08d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C81 4924 bytes
font_01_sfnt_off00012d4e.bin
6c53590be71baf129f7f1a089fdb6acabf3c72da3089c64962cd5bf84fd9a7b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4E 11432 bytes

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