Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc2116e9940db8f…

MALICIOUS

PDF

71.1 KB Created: 2021-01-23 13:16:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 011dd888ca1d295b509d054716584a3f SHA-1: bffd42a6c842457dd8531a566dd0c75b8118ef73 SHA-256: adc2116e9940db8f7c310be5a5c749e9d7720f1b8ef03a9a17f2d6c071a2dd00
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and a specific URL pointing to a download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to trick users into downloading further malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/123?utm_term=backyard+sports+sandlot+sluggers+pc+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493602/normal_5fea1614c290c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484624/normal_5fd7ad10d2699.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413966/normal_5fcd2734b66d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366385/normal_60081712c7e63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530868/normal_5fd9d31907929.pdfIn PDF document text
    • https://site-1172602.mozfiles.com/files/1172602/switch_pro_controller_blue_light_stays_on.pdfIn PDF document text
    • https://rebavunegiluzu.weebly.com/uploads/1/3/4/4/134497465/0955e2282d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417413/normal_5fce8f8d7a1db.pdfIn PDF document text
    • https://site-1178876.mozfiles.com/files/1178876/sirocco_definition_world_geography.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/wopimevaxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368485/normal_5fcdb8097cbcc.pdfIn PDF document text
    • https://site-1166676.mozfiles.com/files/1166676/spade_card_meaning_in_tamil.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/tifuwuw/41102720195.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/xuliveforolutig.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/administrative_manager_duties_and_responsibilities.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/zoburez.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_off0000d79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79B 5548 bytes
SHA-256: 46b5088d30f6d734be7901fbd8a7dd5f90d46ab73de7a73addfd0ef0817af0dc
font_01_sfnt_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 10712 bytes
SHA-256: 31fd76b492cabf8b581c579314684730569156d31986a619e24804962839edea

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