Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1255ec16def0ffe…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 05:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08103568da06b5e466dcf91d050afb07 SHA-1: da0eb85f077de5ee4c4a08b9baa21d816e64d15f SHA-256: d1255ec16def0ffe3c4fb66b7240af69cadd5d496139dc1a6b5aa69946318957
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to redirect users to malicious sites or download further malware. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://inwebjor.ru/uplcv?utm_term=mp3+rocket+for+android
    • http://dianacb.cz/userfiles/file/91609613470.pdf
    • http://namngonviet.vn/user-/files/rusaxakafojuzar.pdf
    • http://mastera-mix.ru/ckfinder/userfiles/files/16215717839.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/rh8snvv5g0fot7cadcu05e5fko/74565111435.pdf
    • https://el-tall.pl/pics/file/94994803955.pdf
    • http://erbamedica.org/userfiles/files/jotofagorebozubezutis.pdf
    • http://celesteandtorsten.wedding/images/file/tifixukosikuzegawifale.pdf
    • http://innotack.com/userfiles/files/mominatipimolenupumibipij.pdf
    • https://remini.hu/userfiles/file/jifamonejoludelubib.pdf
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/59137318178.pdf
    • http://soluzionebenessere.eu/userfiles/files/96203761174.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/muzivitikafalalej.pdf
    • http://ahcxdq.com/uploads/file/02072208649.pdf
    • https://yukkumpulgroup1.com/contents/files/zizad.pdf
    • https://senarathgroup.lk/assets/media/file/ralagiledetozif.pdf
    • http://futimisdev.com/userfiles/file/seginalusutef.pdf
    • http://www.radio-kum.si/data/files/77026093329.pdf
    • http://federicozucchettiarchitetto.eu/userfiles/files/sofiva.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344e691a083---juwuverupepepufeju.pdf
    • http://pillshop.ru/uimg/files/71642112275.pdf
    • http://csc0451.com/userfiles/file/20210902075134_3gehgh.pdf
    • https://mimpiindahsatu.com/contents/files/94240992660.pdf
    • https://value.ae/userfiles/file/19154500833.pdf
    • http://avandcie-energy.com/ckfinder/userfiles/files/ruwofuvinuwasovak.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/2907774859.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df33.bin
6599f86897ae7eb1c9cfb2635508c47cceed8cc76c66c8ece4ee5aca10393f06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 18332 bytes
font_01_sfnt_off00010e55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E55 16792 bytes
font_02_sfnt_off0001266c.bin
93e68f8df6cc2273c217d9496f1ce2df84112fc17f6e92a65f90701595079794		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1266C 10656 bytes

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