Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17071272b12cb50…

MALICIOUS

PDF

67.4 KB Created: 2021-03-09 23:55:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3bd6bbe574abcb315a17d1d542952960 SHA-1: 0aa50565e0c87ecc96e9fdc2722c7d0c7e56ba8b SHA-256: c17071272b12cb50bc2115f547c72b982f605da8b14ede5e728b1455ab2cfd1a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one specifically pointing to a domain associated with phishing lures ('jumiwimov.ru'). The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/aws?utm_term=yashica+mat+124g+buy PDF link annotation
    • http://xteenware.online/23844148060yr873.pdfIn PDF document text
    • http://pollsexpert.com/cracked_nord_vpn_apkxk558.pdfIn PDF document text
    • http://p-kavkaza.ru/501997627140dh0x.pdfIn PDF document text
    • http://smeh-mif.space/luvumov9juc5.pdfIn PDF document text
    • http://instasurprise.online/inscription_bfa_guide_1-_150emu2o.pdfIn PDF document text
    • http://chistohome.moscow/fios_home_router_solid_yellow_lightdba9o.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/bushnell_16mp_hd_essential_e3_trail_camera._see_more_reviews.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_7b6e9d0fa24c407a8055dc0e462a4fcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/63426558951.pdfIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_9641274a9d2c4d1caa870dbdff0e3363.pdf?index=trueIn PDF document text
    • http://tipipigi.atwebpages.com/comment_faire_la_grande_ablution_en_islam.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/12446096253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f9d6045-4df1-43c4-bf58-489c683f52e5/probability_and_statistical_inference_solutions.pdfIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_4538ef0982614cc8bc548789968a52d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b50c1691-d846-4ccf-81d1-8b920427c119/nikokarak.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/99407176583.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_01e5b8d720fe4c15a736cfcf22c49977.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43a5b035-18b0-4e6a-95be-7461a0c2231e/python_list_function_sort.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_off0000c8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E4 5560 bytes
SHA-256: ddb75560ef737d3d0afa73682b6c73733a150b98aad36cb6fa4ab2400b870bee
font_01_sfnt_off0000dbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCD 10840 bytes
SHA-256: 0f46510dd63b80fe2ccbdf4a363e5a67b2d44c119c3bdea638898e4c07cf7cf4

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