Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d15ba3f839f38f…

MALICIOUS

PDF

77.9 KB Created: 2021-03-14 02:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a65a4bf44510f09843ee1e25058eaf5c SHA-1: 7d4db1ab8f3d4d6256fb08a6d9a64bb0622fb7b0 SHA-256: 90d15ba3f839f38f111c80906e98a8fb6910533345e6b89fad4e4f982f2aeec9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs, such as dafemum.ru, suggest a phishing or spamming campaign. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=2021+toyota+camry+se+awd+review
    • https://cdn.sqhk.co/nakijalufiw/5igxnif/duo_mobile_new_phone_purdue.pdf
    • https://cdn.sqhk.co/wekaradukuve/hbJ98gj/zaxixiwom.pdf
    • https://cdn.sqhk.co/nowovadizeb/HighbQB/pufobuvatemoj.pdf
    • https://cdn.sqhk.co/birenejar/YndVhdJ/50162805733.pdf
    • https://cdn.sqhk.co/mepofazobi/bTgdkkm/chu_chu_tv_cartoon_free.pdf
    • https://cdn.sqhk.co/lajefage/IAicha1/baby_care_products_cvs.pdf
    • https://cdn.sqhk.co/gabixeme/ejbejdr/farewovagelada.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_2848c733f70043a8a35b7fef9188546d.pdf?index=true
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_ccc353eadf944d0e857fac6530b92e15.pdf?index=true
    • https://s3.amazonaws.com/kovozenamofox/22124347495.pdf
    • https://uploads.strikinglycdn.com/files/637f9dd4-c2c3-444e-b9c9-693f7c5f2dad/jimitifixerogosiketejisem.pdf
    • https://uploads.strikinglycdn.com/files/76306c1a-71cc-4069-9150-4a9d65666516/simple_rest_web_service_example_in_java_using_eclipse_and_tomcat.pdf
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_04bca1b88f51408a929e85f7d07a838f.pdf?index=true
    • https://s3.amazonaws.com/tuzamada/7447663455.pdf
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_69e0b10da51649ad8a872ed2e1191256.pdf?index=true
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_f7afcdceb43c4e2aaf9efc0bf763f142.pdf?index=true
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_343527d3e33245d0be759c33310fa670.pdf?index=true
    • https://s3.amazonaws.com/sogovekevi/bharat_movie_2019_song_pagalworld.pdf
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_74efc7923cd6444f9fc8b2f68f1c3bc5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d56bc9be-b7ae-4a53-a540-4a9a8dd8d410/how_to_reset_voicemail_password_on_mitel_5330e_ip_phone.pdf
    • https://uploads.strikinglycdn.com/files/2604ed73-4f39-4aaf-bf15-edb9626b28ea/what_is_an_example_of_a_hyperbole_in_romeo_and_juliet.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_off0000f106.bin
e5542ec4f9b983be804fc43c06212830ebcd8d3c40c11fe2a17ef2ad2af03c0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 5536 bytes
font_01_sfnt_off000103e1.bin
76ed16411a7a335ff90b195a28674fd4514edd00989cc7817cb6676822632dde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 11192 bytes

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