Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c290b6a8f1f2e8…

MALICIOUS

PDF

74.8 KB Created: 2021-03-13 23:56:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c881cfc16c77e1e4a32750942086ade7 SHA-1: 7e1dc532ee65d6907dc48460427427967e021076 SHA-256: a1c290b6a8f1f2e8322a9a18000d261641c07d3379d338b8b8346a0c91ab7b10
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, including one pointing to `jumiwimov.ru`, suggesting it's designed to redirect users to potentially harmful sites. The document body, though partially corrupted, mentions 'How to make a paper bat easy', which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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=how+to+make+a+paper+bat+easy
    • https://static.s123-cdn-static.com/uploads/4452395/normal_6000d9c05438c.pdf
    • http://kimiter.medianewsonline.com/13474635628.pdf
    • http://lobabinuladeri.medianewsonline.com/muwuku.pdf
    • http://medebupima.sportsontheweb.net/34574462136.pdf
    • http://rajukilodagoje.mygamesonline.org/a_christmas_carol_movie_cast_1938.pdf
    • https://cdn-cms.f-static.net/uploads/4473651/normal_6035d3eaccfd8.pdf
    • http://nadefememidep.medianewsonline.com/24366704642.pdf
    • http://lunagogafoxoj.sportsontheweb.net/how_to_fix_ink_absorber_is_full_canon_mp287.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_3d979492e0b64d9fb7fec79a752a2145.pdf?index=true
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_9f9893631f2a41fdb1d9c99725aa6d00.pdf?index=true
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_3a62f783bfcb465292d9b27a552bcc6a.pdf?index=true
    • http://kopolug.myartsonline.com/85761668258.pdf
    • http://kesupipipiret.onlinewebshop.net/different_parts_of_speech_with_definition_and_examples.pdf
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_62a98730e2044a36850cfbe914158b3e.pdf?index=true
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_4afb2b0ca03a438ca08fd59dc3dad2bb.pdf?index=true
    • http://xobebol.onlinewebshop.net/how_to_write_a_successful_character_arc.pdf
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_b3cc7923e9cc432cad5493d2ffe9dcf7.pdf?index=true
    • http://zotubune.myartsonline.com/a_midsummer_nights_dream_summary_act_1.pdf
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_434e2ae5d350406380f6cc2fc635cd14.pdf?index=true
    • http://mepitar.atwebpages.com/how_to_learn_plc_at_home.pdf
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_09fb955d7613407789f28c1293c25d9b.pdf?index=true
    • 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_off0000e685.bin
f071ea545f3bd4eac5b98b2f596c59ac7a1111669ce587f428d4e469ecc06295		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 5292 bytes
font_01_sfnt_off0000f87b.bin
ea2c2eb3c0ec4e13f291db9ce52bc45d739e0c2c0e3e90de84310468709fc299		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 10524 bytes

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