Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82a2144ff39a6bc…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 13:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a69ce1142b92f34112ff589272fce879 SHA-1: 5c4a7efb1b2feb92001c8084dfcc2976c20064eb SHA-256: d82a2144ff39a6bc93bb99960dcefca7f7aa64cf7bec85b8bb48459ef0e748dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=app+phone+clone+android PDF link annotation
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/mebuwoxugolinukewafon.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/nitubixep.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/21975185407.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/69546438095.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/zilanobiwitunujij.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/12253801204.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/65220683765.pdfIn PDF document text
    • https://jotelek.hu/files/file/barakaxesesuwigekadus.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/mumuvowakarax.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/vasozixivojawuxulewofuki.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/dizasifor.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/masivejaxedadivud.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/vesugifev.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/30847162093.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/japunidinaz.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/74416195083.pdfIn PDF document text
    • http://z500.si/files/piwemuferetelozogij.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/sefenepusedowedemu.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/63931663101.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/zuvotuv.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/42021185089.pdfIn PDF document text
    • http://safarang.com/basefile/files/karokuxuvawodivapobakuki.pdfIn PDF document text
    • http://dakov.hu/_user/file/majijol.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210915115204.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87f648b16ef0a1b60d35cc631d25713d/40554681238.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/14803157676.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_off0000cbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE3 10328 bytes
SHA-256: 63403dc3b5d1bb64d107878a4dbf69c14288cab0b9d18312a9424c683b8b277d
font_01_sfnt_off0000e309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 17500 bytes
SHA-256: 814b045b2400c000eb9ecbc6fb18cf0a144e7fce203f7821d73916192f442f2f

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