Malicious PDF — malware analysis report

Static analysis result for SHA-256 b881a755881a67c5…

MALICIOUS

PDF

78.1 KB Created: 2021-09-15 10:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65ad4cecef5481cbaf0d627bb198038a SHA-1: 3fad5a5c0d2f3da7cefd99ad4e31624c14cf0485 SHA-256: b881a755881a67c5156822f1bddd0ed9394bf9be7061f08a0989ae6ee0f740b9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a probable phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • 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 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://crewmak.ru/uplcv?utm_term=brainstorm+app+android PDF link annotation
    • http://skkl.cn/filespath/files/20210912041108.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/43949864637.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/sebabisotizizuvewifa.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/seporolukusazinavenufef.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/lesineneto.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/bodibal.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/24586305380.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/wibudabewo.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/34783973941.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/fajurilesa.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/59c68c058bf635c92066e1263b6b65d0/dirijegis.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2592df04a87fb4a452b8b70e853d2997/lirisuvevugota.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/xidapufupulumupidabasav.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/15175811005.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/96005718957.pdfIn PDF document text
    • https://palet-school.com/files/files/79536908831.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/19540899874.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/94468239197.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/zokenelopogatodugivumo.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/87244701833.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pojebigife.pdfIn PDF document text
    • http://jinyezi.cn/upload/45425522307.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://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_off0000cf0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71F 17432 bytes
SHA-256: a17a036f4d4890cf087d021c43ce07ac7663d8c8db345208d3618eae31a4dbc4
font_02_sfnt_off000113be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BE 10428 bytes
SHA-256: c8fb44b203ceb6152185d414358d7bfba44ac245ea6844cc1f228896ff62184a

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