Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e70d849b79faf5…

MALICIOUS

PDF

86.8 KB Created: 2021-03-03 11:52:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a2ea0c9a1bfd2a986ac4b4d4ce5d0ef0 SHA-1: b012f06d8d95615b03c8d52ff86d996f966c8716 SHA-256: b5e70d849b79faf519ccf06798a1417e180ef3e359d40a9e7cf590754bb51f28
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, strongly suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=easy+vegan+no+bake+granola+bars PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444095/normal_5fc6ab2597eae.pdfIn PDF document text
    • https://wodokapiv.weebly.com/uploads/1/3/4/5/134584818/guvifufak.pdfIn PDF document text
    • https://pudupujaw.weebly.com/uploads/1/3/0/8/130813100/4898529.pdfIn PDF document text
    • https://ripumunilemaz.weebly.com/uploads/1/3/5/3/135302863/tuwerafomerapa_pobedetunasax.pdfIn PDF document text
    • https://vavuwujaxozu.weebly.com/uploads/1/3/1/0/131070334/97c17842.pdfIn PDF document text
    • https://womarunere.weebly.com/uploads/1/3/4/3/134315700/3590336.pdfIn PDF document text
    • http://roxopazin.iblogger.org/tifemineb.pdfIn PDF document text
    • https://koxowugazetumul.weebly.com/uploads/1/3/6/0/136015765/3793534.pdfIn PDF document text
    • https://josuwolirekovu.weebly.com/uploads/1/3/4/3/134305593/42b3c1c30.pdfIn PDF document text
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/lofogojoz_dejisajinagege.pdfIn PDF document text
    • https://kobuvedubi.weebly.com/uploads/1/3/4/0/134017802/kewobezukuvif.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/bulujono/wapuvewip.pdfIn PDF document text
    • http://losalevova.epizy.com/axis_of_symmetry_worksheet_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/46386673008.pdfIn PDF document text
    • http://rajafidaforuzav.epizy.com/amadeus_peter_shaffer.pdfIn PDF document text
    • http://japolowepipu.rf.gd/42102462506.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/lufabokabuponajazu.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/aqua_barbie_girl_song_lyrics.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 5176 bytes
SHA-256: 0a2e4b7403cd6a745db368fa10d396d5fde57b2441f3e47a78e585b04034fd9b
font_01_sfnt_off000105ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00010e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7C 11460 bytes
SHA-256: f75bf434d03238c26ff9009c5ee0025f6a2ea7ea0458bf9a44e1eda3e497a1b0
font_03_sfnt_off000135d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D1 16728 bytes
SHA-256: 63721fd51f126b844642ec7438215a15500e572fd17b5808f60c3d0afc9e4242

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