Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60d122ff09f0fc8…

MALICIOUS

PDF

77.7 KB Created: 2021-03-10 23:04:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ef8d8a882e56597b88482021e8312e45 SHA-1: a0240078e5d3da8dfdf9b7a11e5d35cb2c8aea03 SHA-256: b60d122ff09f0fc84f8f1b2bfe559c496f2fa9687b64e47a2e6ef8a7fddb1c64
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various domains, indicative of a link farm or a phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://gimoguvi.ru/123?utm_term=the+lottery+study+questions+answers PDF link annotation
    • https://cdn.sqhk.co/pajokiman/c6GVAib/5382823250.pdfIn PDF document text
    • https://cdn.sqhk.co/tazakabebilo/2RyigrD/bupironotujelaluzudisejas.pdfIn PDF document text
    • https://xitolomeka.weebly.com/uploads/1/3/4/0/134012462/7919119.pdfIn PDF document text
    • https://cdn.sqhk.co/dalegoti/jjNjegf/69143133255.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/egchhcW/8436083720.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/f2033aaf27ad0.pdfIn PDF document text
    • https://daxapiruxibi.weebly.com/uploads/1/3/2/7/132712323/2344620.pdfIn PDF document text
    • https://cdn.sqhk.co/pidagasew/igyidjj/boledezisenipew.pdfIn PDF document text
    • https://cdn.sqhk.co/vevajewez/pFfGici/21720641446.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/0oWechf/rc_mudding_trucks_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/panosiritu/YVggMeG/states_and_capitals_game_midwest_region.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/KmigFhc/dizumapelenovafe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gifiz/20916644042.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/jukuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/fojibigovarexoritanapijur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e206757-0770-43f8-9a00-ffdfcf6bb229/diana_gabaldon_drums_of_autumn_download.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/bixefezufizov.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/gafezusuwal.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/vivewasudilelixezemudikom.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/75371324519.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/38983470979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20e23b2f-f88d-4d8a-8da8-fd02cd6f4760/why_students_should_wear_school_uniforms_essay.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 5180 bytes
SHA-256: 23092d750c393d0f3f5e2dbd65a1a12ac4b27c4c0cf9306459c0a3308e7f02ec
font_01_sfnt_off0001051c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 10468 bytes
SHA-256: db67e330af257eb25da9933c47d358da9c6e071e12db6d67ec9198a457934e5c

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