Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afbbed30d47049a…

MALICIOUS

PDF

83.1 KB Created: 2021-02-22 01:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 58b8075c2dafcbaefa56808f4696b140 SHA-1: 89e53742360babc13c2abc7d644c1d931b830f68 SHA-256: 7afbbed30d47049a2730a8906c53525d1f3f9ec5d674bfe9cff20bfff75d586e
164 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to PDFs hosted on S3 buckets and Weebly, suggesting a link farm for SEO manipulation. One critical heuristic identified a PDF link farm with numerous external links, and ClamAV detected it as a phishing trojan. The presence of a download button lure further supports a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=landice+l7+review+runner%2527s+world PDF link annotation
    • https://kezidixujaroko.weebly.com/uploads/1/3/4/0/134040737/5029530.pdfIn PDF document text
    • https://sejevijuwev.weebly.com/uploads/1/3/2/7/132712154/pexifi.pdfIn PDF document text
    • http://ketosimple.online/261875445807etvd.pdfIn PDF document text
    • https://fomoxizukewoviw.weebly.com/uploads/1/3/0/7/130739072/5c7ed5a.pdfIn PDF document text
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/zozapopabomu_guxerot.pdfIn PDF document text
    • http://nubolats.xyz/11614976601dhmnc.pdfIn PDF document text
    • http://dibiwunineso.iblogger.org/pabox.pdfIn PDF document text
    • http://secureappeal.com/zuteliliwolemikitiferanu9pihq.pdfIn PDF document text
    • https://zilexewutefak.weebly.com/uploads/1/3/4/6/134608169/4613627.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/11a623340a6.pdfIn PDF document text
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/6974902.pdfIn PDF document text
    • https://notesorujul.weebly.com/uploads/1/3/1/4/131407176/906c4ced3a1.pdfIn PDF document text
    • https://poxagubojawi.weebly.com/uploads/1/3/1/4/131482812/cacdad.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/dowesitobuga/fekujelaleloru.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/mimiwemonulukukaz.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/xagujejamevovamewutad.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/68782334956.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/lujenewi.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_off0001070f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070F 5140 bytes
SHA-256: 22ddacf7143b00b78ce3a11d50482a37f68668755e38ae18a52e09975b5ba4df
font_01_sfnt_off000118b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B9 11268 bytes
SHA-256: b317aad91c36e448853d455ea921b3629271a447b1d5572113c2ee6af6d81dee

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