Malicious PDF — malware analysis report

Static analysis result for SHA-256 8191eab1c67bb7f5…

MALICIOUS

PDF

99.8 KB Created: 2021-04-28 03:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2221a7f79d31ab3ed71dc98dafbee9ad SHA-1: daae1b3b618f9f6ac16cb8a522ccaa55edd0f438 SHA-256: 8191eab1c67bb7f589d39bc22c14fe06511407a5bfc2bfa73f75853530eb0bd0
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('zajinet.ru') that is likely used for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to software tutorials, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/strik?utm_term=mastercam+x5+lathe+tutorial+video
    • https://nunokewapi.weebly.com/uploads/1/3/5/9/135961733/xoxitevevesakef.pdf
    • https://cdn-cms.f-static.net/uploads/4504568/normal_6068c6e965f3e.pdf
    • https://supidopize.weebly.com/uploads/1/3/4/5/134521205/4029660.pdf
    • http://philonio.online/juwaduzewubomefswasj.pdf
    • https://soputepitup.weebly.com/uploads/1/3/5/9/135973261/pamudokofumer.pdf
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/nupexorifuti.pdf
    • https://cdn-cms.f-static.net/uploads/4449184/normal_6054225a593b8.pdf
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/1545231.pdf
    • http://rapejavom.22web.org/27355032150.pdf
    • http://4d-5d.com/quality_engineering_using_robust_design_phadkem037e.pdf
    • http://olymptrade.buzz/91077113288w4sst.pdf
    • http://labiosdewonda.com/468923604064tu8g.pdf
    • http://studyweb.site/how_to_draw_eyes_manga_step_by_step9p8o7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nitirew/java_jre_7_update_67_32-_bit.pdf
    • https://uploads.strikinglycdn.com/files/c98c2720-1eb9-49b9-9f8a-dfea5158c718/how_to_care_for_patchouli_plant.pdf
    • http://relilirijupike.epizy.com/musuxi.pdf
    • https://s3.amazonaws.com/xutomoxu/how_to_use_standard_normal_distribution_table_to_find_z_score.pdf
    • https://uploads.strikinglycdn.com/files/7d1d0ea5-f284-4999-80da-2ebb414c837e/bedujus.pdf
    • https://s3.amazonaws.com/lizuseguwix/sezapemeweduruna.pdf
    • https://s3.amazonaws.com/vonusirukete/mobewelitijifa.pdf
    • https://uploads.strikinglycdn.com/files/25da3f18-d4ef-491d-afaf-b57177190651/system_verilog_tutorial_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/8b3d0375-debf-47fd-93d9-9a09a7660422/cuisinart_k_cup_coffee_maker_not_brewing.pdf
    • https://uploads.strikinglycdn.com/files/90738009-d639-4556-80c7-3a4119e29d8e/yo_yo_ma_famous_quotes.pdf
    • http://wewufesupupefon.rf.gd/criminal_defense_attorney_in_houston_tx.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014841.bin
162d3c54dd5fecab3897ad87e826664ad3a90a0ef8709b147508262a2411e9b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14841 5436 bytes
font_01_sfnt_off00015aa7.bin
e40f472b58edc7af90ad1ffae2c5c57672e983d4f1b9611f1985e463b7ccaea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA7 11776 bytes

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