Malicious PDF — malware analysis report

Static analysis result for SHA-256 374d86d66019b4d2…

MALICIOUS

PDF

79.3 KB Created: 2021-03-08 17:11:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d600deb4f57d16ef5b72fd10bff5cfb8 SHA-1: 5fb3bb20cf07e56fd0693a375d375543ef97eb25 SHA-256: 374d86d66019b4d2f53cebe34b9cd01dba29d7748face7b5741f5640aa20d80c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as book summaries or guides, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=step+working+guide+pdf+na
    • http://guparob.mywebcommunity.org/my_friend_dahmer_book_summary.pdf
    • http://zolomakowifop.iblogger.org/tipevuj.pdf
    • https://lukuxafibufogi.weebly.com/uploads/1/3/5/4/135400428/7a08c616ee0c.pdf
    • https://kitigenuripoduj.weebly.com/uploads/1/3/1/0/131070171/vosidamo.pdf
    • http://kelimap.mywebcommunity.org/wd_my_cloud_software.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_c901ee17505249f7a9ea8ff319d6b1e5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fbe051eb-4fad-48f2-a60d-2c1f5d23ac71/used_dillon_reloading_press_for_sale_craigslist.pdf
    • https://uploads.strikinglycdn.com/files/26ea010b-e8fc-4629-8d58-cf9f7f6933ae/blade_chroma_4k_camera_drone_price.pdf
    • https://uploads.strikinglycdn.com/files/6b210518-c31d-4776-834c-6001a228c7f9/wimifuwubojefofeni.pdf
    • http://lafagelupuf.myartsonline.com/pairing_yurbuds_wireless_headphones.pdf
    • https://s3.amazonaws.com/zusevamasor/84291534867.pdf
    • http://jujadax.rf.gd/mogadofa.pdf
    • https://uploads.strikinglycdn.com/files/971a0cd7-9ef0-4ed1-949e-9897792367fd/85709458613.pdf
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_ba20698a5a3e470cb39156c16e5170ba.pdf?index=true
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_0a52f3e76c8a46a6a8cf31d893819754.pdf?index=true
    • http://bisawise.epizy.com/pelopa.pdf
    • http://lipaxunuvevi.epizy.com/new_bhojpuri_hd_video_song_2019.pdf
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_780f65a074ff4f04afbdda61414a17d2.pdf?index=true
    • https://s3.amazonaws.com/gusule/jobs_in_kenya_for_form_four_leavers.pdf
    • https://uploads.strikinglycdn.com/files/0bf6061f-ef66-42ff-a5e4-cfa9cc92d404/guzogulavi.pdf
    • https://s3.amazonaws.com/kavugusepe/bmw_motorrad_navigator_vi_quick_start_manual.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_off0000fbda.bin
9f2652ce8c24cf92110d0d51b94e8fcbadb2c81c67115046471f7c2598d87927		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 5260 bytes
font_01_sfnt_off00010de8.bin
8497fad4084592195ab409840369595f939a004347c5140a9be5fa04248c4a76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE8 10044 bytes

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