Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf44c79873398295…

MALICIOUS

PDF

72.2 KB Created: 2021-09-17 04:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f4c2847b2e2deb2be6aaf992ea46d69 SHA-1: fe9d4d6b6c3bdcf7bbb575342fee2c266f708c99 SHA-256: bf44c798733982959e66e52033828c2eae0b938aacc3deb50a806b90712526b9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • 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://atputasbazes.lv/images/userfiles/files/85111042707.pdf In PDF document text
    • https://foulardfotografando.it/file/zuxebibetezobufox.pdfIn PDF document text
    • http://ossokahve.com/upload/file/56773816613.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/58853581308.pdfIn PDF document text
    • http://telecycling.org/files/file/72007571043.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/kebemusivodenevivowo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377b79b425e---megarafoge.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/jobusovajozidagifojubog.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/41978890101.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/31205631213.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/178a27bf5fd3638b8e58c2b9dc508ce4/12020259091.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/73848694402.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/61950355955.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/10417590869.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/53696891969.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/64711500216.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/buwupex.pdfIn PDF document text
    • http://canoeing.by/pics/files/22899224922.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/31209274996.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/majuxesuwefakujotajivu.pdfIn PDF document text
    • http://stefani.cz/fck/file/patibexubuvewozofokikib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pubg+apk+with+obbPDF 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_off0000b131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB131 10400 bytes
SHA-256: 20a4538a5f379cfd61498aada39585f3a56479d12885b3d733b718bcbbc8eff1
font_01_sfnt_off0000c8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 19348 bytes
SHA-256: 363b7a1f1c96f89c009ba0c8d3211aaa71a0ce496821e04b1714842252ac43d6

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