Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f55c45db24a976a…

MALICIOUS

PDF

68.4 KB Created: 2021-02-21 13:48:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2b1d499c6160118ffd7303d89c5f2df0 SHA-1: da004f630ebefa1f791fee3898b3b42594e606b3 SHA-256: 3f55c45db24a976a952ca81c15981f67352c36d253893a52f10324f09a90ed26
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 of which point to other PDFs hosted on various platforms, indicating a link farm or SEO abuse for malicious purposes. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

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://druttle.ru/wix?keyword=american+corrections+12th+edition+pdf+download PDF link annotation
    • https://videxopejevis.weebly.com/uploads/1/3/5/3/135333638/7065ffbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488102/normal_5fcc9b8a6a00d.pdfIn PDF document text
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/sekamemanavu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405925/normal_5fee296b8f828.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/ruduvadagod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_5fdb5fcf6a487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_601b21ca59057.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/vatakefojunib/is_a_dryer_sheet_fabric_softener.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/cercanias_madrid_mapa.pdfIn PDF document text
    • http://nasarijexu.epizy.com/lajuvumi.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/57941435434.pdfIn PDF document text
    • http://paxovabaresubal.rf.gd/16850668179.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/dumolazivitopexa.pdfIn PDF document text
    • http://sizikipap.epizy.com/android_assets_path_string.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_off0000cf45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF45 5660 bytes
SHA-256: 70b889447daae56a55c37baf2c982d31a52ba0c32e1b21af362cd60c5641e407
font_01_sfnt_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 10000 bytes
SHA-256: 726105926a915e16e7bb67e15134eeb8a0d69414bf32083969eaefecc87fbf9a

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