Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b2b3bf5aa8d362…

MALICIOUS

PDF

84.1 KB Created: 2021-09-21 03:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be4ef58601dd6849750631d34f98165b SHA-1: 67111461fb333e7cda6f87fbaaaf7b3be31ae160 SHA-256: f5b2b3bf5aa8d362a690b19e0f8ec40ca9756d11020efc171f982b5a3175c4d5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to distribute malicious content. Heuristics indicate it's a non-clustered link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it with high confidence, suggesting it's designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • 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://allytemp.ru/uplcv?utm_term=site+to+download+philippine+movies+with+english+subtitle PDF link annotation
    • http://www.gpe-el.pro/ckfinder/userfiles/files/72826889614.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/zizusilesawikavivapuneser.pdfIn PDF document text
    • http://spakimthi.com/upload/files/84124364418.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/92022390501.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/pibakewa.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/38650424564.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/34259723427.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/28111523237.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/44984565444.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/ropoxatetaponukisi.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109141638381620.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/jedazuzat.pdfIn PDF document text
    • http://baove24h.info/upload/files/jafukufeg.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/wimufugapewinotetaz.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/90267108485.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/66182596902.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/fawisedexarejaxolurem.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/34177701648.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/90947724066.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/8790446172.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210907_FD1B41CC9A72786D.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/belegejaxobosebejanis.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://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_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 17292 bytes
SHA-256: 7d60be1c8db2a78c9fc39731518eb61c3bcb54f5b18ccc690c2697eedee5c975
font_02_sfnt_off0001287c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287C 11208 bytes
SHA-256: f362ed989b0c4a35ce024e7405e6eb48f01c1d8cc5aa8b9a0b0ce02fc8c79b7e

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