Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2153f35eb757b2c…

MALICIOUS

PDF

74.3 KB Created: 2021-03-04 07:55:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b913e446a91c013e504f42f96711792e SHA-1: c256e37452f946c31ca753bb26bbd2eb017d28c2 SHA-256: a2153f35eb757b2cb2db366c70e1d0c45e9af60130ba2932b303e40217c2340e
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of a large number of external links, many pointing to other PDF files, suggests a link farm designed for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=bsa+water+sports+merit+badge+worksheet PDF link annotation
    • https://duzigolanulemo.weebly.com/uploads/1/3/2/6/132680867/cee7d4d609c3.pdfIn PDF document text
    • http://zarepawofeli.22web.org/36862220684.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/bazugogu.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/give_5_example_of_each_classification.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/dowapag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lukigek.rf.gd/rapakizuguketijuji.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/the_expanse_season_3_episode_guide_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/nager.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/71338975985.pdfIn PDF document text
    • http://wuragumok.atwebpages.com/61388830840.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/57557041884.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/default_dance_roblox_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/kubojidipififiro.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/bams_colleges_in_maharashtra_with_fees.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/nieve_de_garrafa_san_diego.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/gilima.pdfIn PDF document text
    • http://zasegusof.epizy.com/gabunoruj.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_off0000e3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F9 5684 bytes
SHA-256: 3ae7b3681131bc9421e25c94f9cca611b4fcd1986e80c643d2c6d192fd401254
font_01_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 10600 bytes
SHA-256: 53551f250c63d7292b130261577e84f1d465079ad4e82136dbe8887e7013269e

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