Malicious PDF — malware analysis report

Static analysis result for SHA-256 905333e567af431a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 13:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e58990dccf671dbab1b37b2e04af7d29 SHA-1: e546f6df8a9d3285de2e6a6097d12313351ddcf9 SHA-256: 905333e567af431a198019c37b33fcf315b5a79db7d9596f563eeb74fc03e1a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF acts as a link farm, containing numerous external URLs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the 'link farm' heuristic strongly suggest the primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=hacking+mod+app PDF link annotation
    • http://razaviota.ir/basefile/razaviotair/files/geravipisuziluvaxez.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/xunutelik.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/30227764012.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/tisuzomiwofifirob.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9965f0b67d1f25596ef49ac5af9dc953/zepigunebavawur.pdfIn PDF document text
    • http://orenprom.com/img/account/file/fadedop.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/jipikaki.pdfIn PDF document text
    • http://ranchobg.com/img/file/63776333292.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/13280485545.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/jebivizenafi.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/44620250194.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/tizokoro.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/laxaduvep.pdfIn PDF document text
    • https://clinicscrm.com/img/files/33725066045.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/51036451748.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/68052874315.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16140b37fa1da3---gebimopelitodinevejajigus.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109111225096156.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/judutumolo.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/lonapaxikokes.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210904_04F18C6A27180538.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/49933501858.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/pevezuxikibumebesegev.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/livazarexogotuta.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/gujejubawajura.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_off0000e636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE48 19112 bytes
SHA-256: 2f426881d06a57ce73aa7a06730018cbc02e2ec413fad55e90f8b166004fcc09
font_02_sfnt_off00012e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8A 10396 bytes
SHA-256: fdb701f6e41911060e262dacfe085c94578c58047140fa1ab632f563c02728bd