Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfe10d54b7d9fb6…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 22:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 236c0f38658502698a77b151d83a7373 SHA-1: be533177ec129c1b535efcd0a471a19e739e86ab SHA-256: ddfe10d54b7d9fb6184a7804450d59b6b6f3145a4b86ce2ffd4b0d899ca91a22
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with numerous embedded URLs pointing to other PDFs. While no scripts were extracted, the overall structure and detection suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://bilateralmatters.org/userfiles/file/34818125956.pdf In PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109010924081434.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/48506393151.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/65596783219.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/28794492272.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/vadulekibinawakezipuzired.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/36685166208.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/82070134253.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/94272132100.pdfIn PDF document text
    • http://dongphat.net/upload/files/96910111684.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/88481585273.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/gefolufigoma.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/70289847116.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/17026648909.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/segazerugibola.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/bedelos.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/jizureniwodela.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/13441658972.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/vamamomuva.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/kapalesezubizemulujoz.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/ratojepizagibepimoben.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/9870933504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=turn+epub+to+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 18456 bytes
SHA-256: d22fa1a0dcc43cd23c4571a473fb6e06447f40ee04d1091314b68b2488229a8e
font_01_sfnt_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 10224 bytes
SHA-256: 212528f0d896045d1c080c1d6b5beb9ae2e132ce232ad15c5f9eda0bc17a1f4b
font_02_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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