Malicious PDF — malware analysis report

Static analysis result for SHA-256 7100af2d2cc2f7a2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 01:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dbce65d092da4c88f1d00a17c8e0f2c8 SHA-1: 1ba20c6bd02065b8b3861205ecc6b02652352d30 SHA-256: 7100af2d2cc2f7a2450fa794764c8eefd9d2ca06ff803512330d81c12946bda5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to a potential phishing lure related to 'cash app apk for pc'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, further supporting a phishing or malware distribution attack pattern. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest the document's purpose 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://allytemp.ru/uplcv?utm_term=cash+app+apk+for+pc PDF link annotation
    • http://iweldbot.com/ckfinder/pho/files/74806076118.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/kopur.pdfIn PDF document text
    • http://itena.si/uporabnik/file/seluremepukiniw.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6e8220a9ca9b1a229c1c92ee7ca866e9/45819784231.pdfIn PDF document text
    • https://fratellifurloni.it/file/zowijokozapaxabob.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/73822147714.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/tilufuxi.pdfIn PDF document text
    • http://nanopena.cz/upload/file/xinogako.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/16070028306.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210920/0706011505.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/jekatorufulelotisu.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/96105398275.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/80344082520.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1214dfc14---83423803448.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/gexenenasajowizam.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/mezitaririvevufakunili.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/45341973750.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/mixuruxapuxabodidexuf.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/40818642049.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/negegaraz.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/vojiwusiguledijawifo.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/89021932318.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/momopat.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/68445448963.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_off0000de3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 19152 bytes
SHA-256: 4da208d63ffea7cc55414a49aa9a98ea85f703c0d7d28faf76da24d2508d6b56
font_02_sfnt_off0001280b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280B 10228 bytes
SHA-256: f33c5b9c6551bb3c4a4b6c69f8d5ff8988b08f8dddf203f8dae897420d017de6