Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff33259ca536e280…

MALICIOUS

PDF

75.4 KB Created: 2021-02-21 02:16:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bbc2126d6d1711a41cbbe9f33935781c SHA-1: d1206c5e31a2b81fd7aeefd87bde426ea6ec7c90 SHA-256: ff33259ca536e28009a5372ec5ce9b430bc2a83c00381a63c2655c806d873afc
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with a critical heuristic identifying it as a link farm. The primary external URI points to a URL that appears to be a lure for search engine optimization, suggesting an attempt to drive traffic to a malicious site. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

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://seumenha.ru/wix?keyword=asm+study+manual+ifm PDF link annotation
    • https://rufajesovulibo.weebly.com/uploads/1/3/4/2/134235528/45235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412573/normal_602490595eb2a.pdfIn PDF document text
    • https://cdn.sqhk.co/mifodirula/5hhhbmh/star_wars_dice_tray.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvevalor/7ViibvX/fortress_defence_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gojogefe/i9uqzhd/bevefomarilojilogalemo.pdfIn PDF document text
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/navupifuka.pdfIn PDF document text
    • https://cdn.sqhk.co/zomulusiku/ifpkvhb/kemaxidinegaboke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467945/normal_601dbb56815c3.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/cib5gg0/hey_band_app_for_pc.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/sorapobuk/susakilowobusot.pdfIn PDF document text
    • http://raxusitusumulag.rf.gd/automotive_lighting_design.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/creative_design_websites_templates.pdfIn PDF document text
    • http://mejavifoxeb.rf.gd/capital_and_counties_annual_report_2018.pdfIn PDF document text
    • http://ledukuxadom.epizy.com/82745292457.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/kusalavakinuzugabeso.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/33476327319.pdfIn PDF document text
    • http://gateguka.epizy.com/zulokaboku.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_off0000dfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 5048 bytes
SHA-256: 7c246792309333f2b8e0c9f2fe39f26d9e2e6e87b41cfb2ac39ddab934e2e24d
font_01_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 15420 bytes
SHA-256: c8d5fd13943dcdde376fb051bf86cce39da3ea180127e5a09004da965d9da2f3

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