Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d4e37981e34e14…

MALICIOUS

PDF

73.8 KB Created: 2021-02-24 16:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ab92ba2e5fb57a4b386f345316a3c274 SHA-1: 4bee9734ed8698285e1bdc22465f4daf30678f33 SHA-256: 18d4e37981e34e14a32ba314de6b3722f9e2352e2f2d2b27abde76e74da2f302
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated, but the presence of external URIs and the ML classifier's high confidence score indicate malicious intent. The ClamAV detection further supports this, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://maypoin.ru/strik?utm_term=is+python+the+best+language+for+beginners PDF link annotation
    • https://pevexozu.weebly.com/uploads/1/3/4/8/134857768/2305505.pdfIn PDF document text
    • https://ferofetilusef.weebly.com/uploads/1/3/5/3/135346026/dufuvikuvifojuvumi.pdfIn PDF document text
    • https://kusafulidofet.weebly.com/uploads/1/3/4/0/134017607/6a28bd6.pdfIn PDF document text
    • https://vusutiti.weebly.com/uploads/1/3/4/7/134762674/1459889.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/sony_cdp-cx355_belt_replacement.pdfIn PDF document text
    • https://cdn.sqhk.co/kebokeregim/fgg6mWB/7906306169.pdfIn PDF document text
    • https://xagomutub.weebly.com/uploads/1/3/4/3/134321984/kemos.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/telewo.pdfIn PDF document text
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/1365438.pdfIn PDF document text
    • https://cdn.sqhk.co/dunokufimove/Thr7O0k/mebujejij.pdfIn PDF document text
    • https://kamedewogivazu.weebly.com/uploads/1/3/4/0/134096977/6834216.pdfIn PDF document text
    • https://cdn.sqhk.co/ralofobo/egI5Bhg/60704175330.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosajeku.myartsonline.com/the_great_hunt_audiobook.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/xawoki.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/cbse_examination_bye_laws_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/bikisabufuruv.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/govuxobodibabo.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/free_no_carb_diet_plan_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/hemostatic_agents.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_off0000e0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 5344 bytes
SHA-256: 04614219036b48b3171dc241baf5ddb9081ce36a9acb695b86cf1674ad1156d5
font_01_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 11300 bytes
SHA-256: 8517b927b9e8961236052547405ce1a1187d2a158524a180884862aa8c12ee80

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