Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a951f0eefecdc84…

MALICIOUS

PDF

87.4 KB Created: 2021-03-29 05:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7f57b0b22a336426f285d4fd7ac19ff SHA-1: 41f7c34d4fef4bc23804d932ff6f02882109951e SHA-256: 4a951f0eefecdc840c45a0d89470ff3a146616848a0ad16b5f23d570e941866f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to a potential phishing or malware hosting site. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=static+image+definition
    • https://lexigeme.weebly.com/uploads/1/3/4/5/134524735/pevegitum_sefuferusizoja_mujuzunelurufoj.pdf
    • https://static.s123-cdn-static.com/uploads/4454988/normal_5fe4b553dc441.pdf
    • https://mibiduzomezo.weebly.com/uploads/1/3/5/3/135327428/bfdbf7.pdf
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/poxesaragesu.pdf
    • https://xoburevedevubuv.weebly.com/uploads/1/3/1/3/131380480/78ffe846b74.pdf
    • http://zamodinije.22web.org/19939939813.pdf
    • https://cdn-cms.f-static.net/uploads/4405929/normal_602be254554a7.pdf
    • http://begefif.iblogger.org/basin_street_blues_piano.pdf
    • https://cdn-cms.f-static.net/uploads/4486522/normal_6061205547ad7.pdf
    • https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/49a0eb.pdf
    • https://cdn-cms.f-static.net/uploads/4377931/normal_6038b4805222a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://losojotatilo.epizy.com/61808172756.pdf
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_40cc4e75e74a4fb4adecb87ce6526667.pdf?index=true
    • http://kukolugirutufu.rf.gd/50092326015.pdf
    • https://uploads.strikinglycdn.com/files/71c170b2-0a1a-460d-bfeb-9bbaa22da65c/how_to_update_apple_tv_box.pdf
    • http://diwiludoki.rf.gd/logitech_wireless_mk320_drivers.pdf
    • https://uploads.strikinglycdn.com/files/4a34f007-219d-4651-aaca-4bff7017e04f/best_sale_price_on_kitchenaid_stand_mixer.pdf
    • http://dufosulux.epizy.com/download_mapa_mundi.pdf
    • http://tuxefefili.epizy.com/52078081790.pdf
    • http://bupinobofuv.rf.gd/zidovudutemu.pdf
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_c44e14468fad42c7adbc37f6a1c7806b.pdf?index=true
    • http://naxezutozotos.rf.gd/puzogexune.pdf
    • https://uploads.strikinglycdn.com/files/7690ca98-f0ef-416d-ae5f-fd1a0f876ad1/the_pit_and_the_pendulum_escape_room_answer_key.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
    • 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_off000101b6.bin
3250a36ee020bd81c0ac43a4f27a8be2fb1b3732e837ba84b0620136daac4c7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 5140 bytes
font_01_sfnt_off00011327.bin
62d8758d00e98183a13e49887a4b9925c24802b7f28f240f650a612cfcde6217		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11327 11616 bytes
font_02_sfnt_off00013ac0.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC0 16204 bytes

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