Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd42f2e47b20044…

MALICIOUS

PDF

80.6 KB Created: 2021-03-24 00:06:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01fc6640c899c8bc27f5cf9a9f4cd7d9 SHA-1: 4ffa22249160374edb9e724c9f1d7739eb148cca SHA-256: ffd42f2e47b200445ee18d56c4e045b64599d83cab9c1b3763822845f3969d93
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/123?utm_term=bootstrap+templates+for+application+forms
    • https://cdn.sqhk.co/mapelimujeku/D8hidji/kpop_groups_list_male.pdf
    • https://cdn.sqhk.co/jogekiluse/djivjdS/26429001582.pdf
    • https://cdn.sqhk.co/kowalaxu/NhagfFh/dulojipetodegexexoviro.pdf
    • https://funogefoxareso.weebly.com/uploads/1/3/4/0/134041001/vevuvimenup_bureju_xetiwumepemi.pdf
    • https://kevonixoxudunu.weebly.com/uploads/1/3/0/7/130775897/sevisej.pdf
    • https://vifoluliguj.weebly.com/uploads/1/3/1/4/131437350/falegitiworus.pdf
    • http://koxutafup.iblogger.org/astrologie_kabbalistique.pdf
    • https://nulaxevaximuji.weebly.com/uploads/1/3/0/7/130776814/693cdcaa761.pdf
    • https://cdn.sqhk.co/nudavede/jajlHid/53022420317.pdf
    • https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/makugojijed.pdf
    • https://cdn.sqhk.co/wugunifikezu/ijiigic/15930054028.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sasomibaben.rf.gd/baburnama_file_in_english.pdf
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_46f6b66179484e198247acd9e1ec9878.pdf?index=true
    • https://s3.amazonaws.com/dobikasukavu/english_textual_concepts.pdf
    • http://posopikepikan.rf.gd/diccionario_espaol_ingls_espaol.pdf
    • https://s3.amazonaws.com/vogubivajavofu/pm_awas_yojana_registration_form.pdf
    • https://s3.amazonaws.com/remufuzu/elements_of_statistical_learning_stanford.pdf
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_466c7f5552fe49538c6400808e5b99ee.pdf?index=true
    • https://s3.amazonaws.com/dupula/12022054071.pdf
    • http://sajutab.rf.gd/18037176226.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_off0001007e.bin
0763436a9b1d9b46d73ce9a85ee4d7288724a86a4229b0e6510be0a1259e379a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 5212 bytes
font_01_sfnt_off00011227.bin
66d284513d906635f932c9f945aaadb60c93c3da8fceeb6aa7e4d1df20627a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 9756 bytes

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