Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62ff885e37478d9…

MALICIOUS

PDF

77.3 KB Created: 2021-04-16 04:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 35751451a9345cf8a7e80e5cf6ef1bc4 SHA-1: 18d722aa8372f8448cb79934a8650f1460ee4979 SHA-256: d62ff885e37478d9fe36771c77c627b20a86e291db7fb68e02ff3610561d81e8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=the+goetia+of+dr+rudd+review PDF link annotation
    • http://pankreatitum.ru/how_much_transmission_fluid_does_a_nissan_murano_takeylc6y.pdfIn PDF document text
    • http://xepekil.iblogger.org/critical_ops_mod_apk_ios.pdfIn PDF document text
    • http://milansit.space/373679749132lsz0.pdfIn PDF document text
    • http://siankaanmexico.com/tetoregimiretatoputsnr9b.pdfIn PDF document text
    • http://likelid.xyz/scott_pilgrim_game_background_characters6zfr4.pdfIn PDF document text
    • http://honey-love.ru/warumasukimirupisofabovu5so96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tosego/wolizixog.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_f215bbde6cae4f3884920e06c75bdf15.pdf?index=trueIn PDF document text
    • https://a0e9597c-cfbb-4fc1-b0e0-47ed6411b148.filesusr.com/ugd/24269e_592a6e06c70a46b2b68f67a00ffe0c6e.pdf?index=trueIn PDF document text
    • http://rotaduwifomol.rf.gd/green_effect_background_video.pdfIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_314126da1e724d8cbfbbca4cbed81749.pdf?index=trueIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_f83be5cc8fe8406dbee7c7cf632f53ac.pdf?index=trueIn PDF document text
    • http://texazufuvo.rf.gd/coraline_book_online.pdfIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_5fc92e56a461459b81a9e6a510fdf55f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/pozexefoxovumiberolinu.pdfIn PDF document text
    • http://suwugiborewetel.rf.gd/2213115078.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/reziluguriliboseregijip.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 5060 bytes
SHA-256: 6acd1963fc70861a4990bb0c1ebbe13d5650371d4c726a8a9d94ae9fb5bdd57c
font_01_sfnt_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 10892 bytes
SHA-256: b1fc67ee637a75080b79e6b9bca6a5f483b636dbe60b0de9fdb2ecce98b023a3

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