Malicious PDF — malware analysis report

Static analysis result for SHA-256 e526de50d7bbf09c…

MALICIOUS

PDF

106.8 KB Created: 2021-05-31 22:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: dc09b4cd0c76f1134e3936abd1e81660 SHA-1: d43ee0d2c7b4d5f1bd4eb4d9daf181ff9593dbc8 SHA-256: e526de50d7bbf09c4e13c2971560f6d0040b963619293830eeeedde3ff61ce4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with a high-confidence heuristic identifying it as a link farm on disposable hosting. One prominent URL, 'https://golowaki.ru/123?utm_term=businessman+telugu+movie+online+free', suggests a lure related to movie downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://golowaki.ru/123?utm_term=businessman+telugu+movie+online+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496616/normal_604a2e6fb42c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405922/normal_602bb0eba99f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414166/normal_602207988b591.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417206/normal_5fedfdbe74125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449004/normal_6054e01e41a1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476126/normal_5fcc739ce7e88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_605721bf5217d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447626/normal_5fd6fbba45d09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473637/normal_5fce5c65c8569.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420906/normal_60555024891f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476270/normal_6012dd322413d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4423195/normal_60b1908f711c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502245/normal_600fcfef05ab5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144419124/zogiborotigapafosa.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144420564/how_to_get_shimeji_on_computer.pdfIn PDF document text
    • http://dekokos.pbworks.com/f/how_to_get_ssc_duplicate_certificate_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda073f9-5db6-4e37-9ab5-58a0a3548cb4/53689242169.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/58577706277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9d2afc-c865-4d14-b22e-62ffa201b521/16548817935.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144415806/convergent_vs_divergent_thinking_reddit.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/john_deere_425_mower_deck_belt_diagram.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144422454/zarobirijebogojepomejedid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76db73d0-31fc-4c9b-9772-6ce0d7d0d4ce/can_you_buy_a_rainbow_vacuum_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1921e2ec-e1fe-429e-973e-f167eaec68fd/geforce_8400_gs_gpu_benchmark.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/37205160018.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/online_live_tv_software_free_download_for_pc.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://scripts.sil.org/OFLIn 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_off00015022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15022 5196 bytes
SHA-256: a350a097abfd1a7c5465bb41e0ab921473f21c42336faab5ba8fb6402416ffb6
font_01_sfnt_off000161c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C7 11100 bytes
SHA-256: c655d2596cacb50be7284a7fbf804e76977b56d1514a0a9a53e8d3daafd88a3d
font_02_sfnt_off000187c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187C7 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8