Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9786d54c3de000…

MALICIOUS

PDF

78.6 KB Created: 2021-04-30 13:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6d125c73131f4cda368d02fae4ef6199 SHA-1: c606224c18c03eded9784d0fe8ae6bfe30eabf21 SHA-256: 5c9786d54c3de000ec0581c514d75594d8aa8351166dea4f97b37b481cd1dbe7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=unidades+de+peso+del+sistema+ingles+y+sus+equivalencias PDF link annotation
    • http://strapslap.online/sakusutivenujic31t6.pdfIn PDF document text
    • https://bilobunu.weebly.com/uploads/1/3/5/9/135969114/gonodeno-sigavawisekis.pdfIn PDF document text
    • https://josojizaxa.weebly.com/uploads/1/3/5/9/135966587/kimurunubigeri-rowise-vojazalu.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/ajhzhfm/tapijofuwipigajujijudajok.pdfIn PDF document text
    • https://cdn.sqhk.co/denalivek/gikihjf/way_of_retribution_awakening_best_class.pdfIn PDF document text
    • https://cdn.sqhk.co/lululitoj/e6GFmGb/fireman_s_park_verona.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/eXvsjhd/10187358421.pdfIn PDF document text
    • https://kawavaturitavo.weebly.com/uploads/1/3/5/3/135321378/zawidipulose-tamelukovat-robawalazu-zivexele.pdfIn PDF document text
    • http://d2-club.ru/cable_size_calculation_formula_ukixevx.pdfIn PDF document text
    • https://cdn.sqhk.co/rukugewul/e8Efzjj/raiden_legacy_mod_apk_data.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/38556411802.pdfIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_e45f34e26f384fb696860fbe5b016710.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/97121983802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9800ccfe-ada6-4764-bc9a-ef4796138d57/fuzepiro.pdfIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_a4525a9d3fd04dea80df4f1d1e7bce2e.pdf?index=trueIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_0eff376d2f3f46d594931e024c6c772a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/213d5e81-c781-4340-8f57-6494133c78a9/blackdecker_string_trimmer_electric_14-inch.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/71836443546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae1da30f-e60b-4434-8c6a-8012a000e13d/33836190429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/337e9b67-1321-4a1a-91b2-2a96b0575968/sub_zero_ice_maker_quit_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b549ee68-8a32-459f-9c81-e2042a9859ab/nc_drivers_license_number_format.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 5576 bytes
SHA-256: cbd8178e5342c208e066d6874df65d7dac593f966de170d9ad09749eeea600b9
font_01_sfnt_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 11780 bytes
SHA-256: f85ca6781b813e2c4395b16d30d0c6dcb8122c4dec68cd79966c1ef806777483