Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c6d8ac42b269a6…

MALICIOUS

PDF

69.7 KB Created: 2021-04-10 12:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e3c6c64ee422871ef6b097331a0e17f3 SHA-1: bc97325a519ef5136c0439351ae30165797fd638 SHA-256: f5c6d8ac42b269a6d111802e1e2dd81d2eea115f6a228ae9d0f7dbdfb902563f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classification and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which can be used to create malicious PDFs. No scripts were extracted, but the presence of numerous external links points to a likely attempt to redirect the user to a malicious website or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://golowaki.ru/strik?utm_term=golf+buddy+voice+2+manual+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481064/normal_5fdf38d07e46b.pdfIn PDF document text
    • https://vakevugulipew.weebly.com/uploads/1/3/4/5/134507067/2621439.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/hz7ehag/software_update_failed_iphone_6s.pdfIn PDF document text
    • https://cdn.sqhk.co/nolovojawek/fhb1eIV/free_fidget_spinner_spinner.pdfIn PDF document text
    • https://cdn.sqhk.co/dizoketa/ksLhdha/bengali_movie_song_sathi.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/buwefavugalosup_vagigiwonor.pdfIn PDF document text
    • https://cdn.sqhk.co/rizakumer/jdygjOn/bidufomekukikozudukaneti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495059/normal_605556aeaa5c7.pdfIn PDF document text
    • https://cdn.sqhk.co/duwefetufe/J4ieKhg/cnbc_market_news_reporters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371800/normal_601884c31b29f.pdfIn PDF document text
    • https://cdn.sqhk.co/nivopekodi/hd2xjca/crafting_guide_osrs_free_to_play.pdfIn PDF document text
    • https://cdn.sqhk.co/zesozote/ehh6jam/fellow_eternal_clash.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415544/normal_600d5054f1672.pdfIn PDF document text
    • https://ruxunomitebapat.weebly.com/uploads/1/3/1/6/131606858/574c5763.pdfIn PDF document text
    • https://tibomomaludo.weebly.com/uploads/1/3/0/9/130969572/3797797.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/79hLOic/95933129502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_6052f6fc3eb08.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenodisoda/jfhgOjd/mini_cooper_dash_camera.pdfIn PDF document text
    • https://nimifitirujaga.weebly.com/uploads/1/3/4/6/134693460/7006421.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b931a96-3c0f-4abc-9549-feb429529bdf/27022162740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/298dcb1f-2913-464d-9507-b2f2e3eb496e/nofixopobevilatamabim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b88f2a30-3d12-404d-bfc4-f0d4e69dbefc/python_for_loop_continue_break.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_27e700e8131f490384e9cf403eb83e31.pdf?index=trueIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_e130458dbed04b27bf77fec795d0e5f0.pdf?index=trueIn PDF document text
    • https://736f3f86-ac4a-4d06-be6b-3320275ea8ee.filesusr.com/ugd/cd27d0_2816bff4e26445419728f7b17e6a1365.pdf?index=trueIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_a2f97135ab074ae78259c23aa48faecc.pdf?index=trueIn 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_off0000d3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AE 5492 bytes
SHA-256: a971651f092732e1cdda2bcbc1ff83ceadf507dee13b748c7b3c752c3c1690db
font_01_sfnt_off0000e663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 10252 bytes
SHA-256: 51273c825b39687dadbaaae3a706cbe697a39cf19ab9b09ea3570906776248fb

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