Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d7c156ae2341ee…

MALICIOUS

PDF

74.8 KB Created: 2021-01-10 20:28:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 357437b2bf926eb146cd9f4c499f5ddf SHA-1: 7e714f104650f91925475b854401c5cd8343ee9d SHA-256: f3d7c156ae2341eea68f702bd6951798a002d510153d2e7df6a0e3152c7a6a0c
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, and another for a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=tabla+de+kilometros+a+millas In PDF document text
    • https://jewelalebun.weebly.com/uploads/1/3/4/5/134585336/ferizeforuzakabujixi.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/bibCpUt/47825680149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388412/normal_5f984105bfbd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425214/normal_5faa2c990aeb3.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/ccf6e063cd927.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/bidivo/62104784462.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/karusopavogamixobilo.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/22317243536.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/mobujag.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/alora_sealord_sally_music.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/pdf_to_dwg_converter_online.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 5124 bytes
SHA-256: 8f1025113c2a8cff3f8fdd98918522a4bf491558070b1cba3a1649781c14b6fb
font_01_sfnt_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 11068 bytes
SHA-256: 9aee6079f3ba4e5a3a14a24f05d99a4934d02908d83321026a337f5d5ca013ad

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