Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e5f27cfdc27b43…

MALICIOUS

PDF

78.8 KB Created: 2021-03-11 23:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4fef69ab8de17afdfad38468acc4701f SHA-1: 5a7d7ddeeefb97ee68b909c90d0c6ddecd36e21a SHA-256: 16e5f27cfdc27b438eb4e5d4a306074d0c7fd61a9927b0253736902e8fea0ad6
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to redirect users. The primary URL identified is https://botokaw.ru/123, which is likely the ultimate destination for the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/123?utm_term=largo+al+factotum+sheet+music+free PDF link annotation
    • https://zerakilun.weebly.com/uploads/1/3/2/6/132695460/fb8519b278c.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/41083015778.pdfIn PDF document text
    • https://wawotisusuwo.weebly.com/uploads/1/3/2/7/132741293/3486054.pdfIn PDF document text
    • https://berebexamoleti.weebly.com/uploads/1/3/1/3/131384136/larukuje-xeritedukitevow.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/83941293905.pdfIn PDF document text
    • https://wapofowivukixog.weebly.com/uploads/1/3/4/0/134017250/sigubonunafajixuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491688/normal_60216e8bbc04b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_5fe65101af794.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/d7996683-2df5-44ac-a990-037616ca2ed8/nunarutozozolu.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/78642745941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5f7e20e-f6dc-41b5-a1f3-3efcb32fb97b/jbl_flip_5_review_soundguys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29177021-913a-473a-8cdc-4d1860ad55ce/rawuxomuzepalapux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb785904-c063-4667-8a95-dd6b3698b277/advanced_algebra_2_worksheets_with_explanations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ef8c1fe-9f7d-4956-b957-68dd2317b191/tadusuwuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383e69b7-f3d3-42e5-837f-cb5919aa6741/1580473933.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/vpn_apk_for_mtn.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/cs_go_free_cheats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bac5ad1-5004-4580-8783-d044774fa990/36603727514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba156307-68fc-4dfe-825f-9f9df284ff89/tisexopukofidilubite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab305589-274e-4572-9bb0-08693e5a5062/jorulepopinesomopeginax.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/autocad_2013_64_bit_xforce_keygen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a7a2ce7-3e1f-4e5c-b706-335010062480/96078641530.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 5236 bytes
SHA-256: 8b07047b06398944fac21322a8b7525762f0e161cecb032a06255e8eb3853ae9
font_01_sfnt_off0000ee90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 12456 bytes
SHA-256: b20be1313c7651d6e44d47a4451d7ef1eddb70f79726ba8b7493da0471b45454
font_02_sfnt_off000116d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D3 16076 bytes
SHA-256: 58ab0355b12e7deceedda9b43bc31de04a7630cd803884eb04189384e4c03267

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