Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c5b58a955b9480…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 15:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f3f3283333376dd907ad7dc2adca986 SHA-1: 43c85cb14a9d1cd96e88f500cd9a30708d17144e SHA-256: c0c5b58a955b9480d2593999ed6f26342d2afbf980ab3d5594cabbf3bf9bcabd
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While 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 0.9860

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://garglob.ru/uplcv?utm_term=cach+nau+cari+ga
    • http://myucmas.com/userfiles/file/dafunupisopoxajuxulozaxa.pdf
    • http://otohondamientay.com/upload/files/96138857958.pdf
    • http://flamefitnessstudio.com/cewit/images/file/5263751731.pdf
    • http://bjxbw.cn/userfiles/file/13182149038.pdf
    • https://flomogroup.com/upload/files/23408681910.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438dd760bb0---98272198399.pdf
    • https://big-affaires.com/img/pics/files/luzowipiwa.pdf
    • http://edmo-cars.nl/images/file/vumunuzulasupiv.pdf
    • http://laboratoriologos.it/userfiles/files/guguxanuvezukizix.pdf
    • http://rainhouse.kr/data/editor/file/6238023056130cf0e41d23.pdf
    • http://www.derbysignandgraphics.com/uploads/file/6895643526.pdf
    • http://kubkao-kubpla.com/userfiles/files/tegarujaxidukeza.pdf
    • http://rana-international.com/userfiles/files/18558272922.pdf
    • https://akconta.com/uploads/files/togutetofimutalulomifi.pdf
    • https://vnjhanoi.com/upload/files/32538824436.pdf
    • http://thessalonikiflights.com/files/files/gadov.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/25728472757.pdf
    • http://www.anclupnapoli.it/userfiles/file/daxetajegokifusone.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/zeraridileduxaw.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443c56a5a7c---88758189192.pdf
    • https://megatex.ua/images/uploads/file/88574775231.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141445dd744c---tefokevekowoga.pdf
    • http://xn--80aikni6a0b.xn--p1ai/images/file/57886721217.pdf
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/vopuwositejitiwugig.pdf
    • https://signatureshreyas.in/userfiles/file/nofizinugukugizogabuv.pdf
    • http://fusiongrup.ro/userfiles/file/71714946126.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_off0000db02.bin
fa9c600ab9e12363e47b4afde9a561a3870a112b934ed11c3659c7e8612387af
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 10076 bytes
font_01_sfnt_off0000f14c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 16792 bytes
font_02_sfnt_off0001095e.bin
95bc21083cf65e2a6613990dbd31604b2806e64a1b8f62d3c62e79c4618b91ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 22920 bytes