Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56a728015553aef…

MALICIOUS

PDF

88.3 KB Created: 2021-04-27 09:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9b8c4767585b8aac6765e30379e17d9d SHA-1: 94a469d16b4abbbd26b0f7b4c9fc33c2bfac35c1 SHA-256: f56a728015553aef6644fdcf36afbf82f7f7016fdc349b27af3b30acb2a1209e
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it is a PDF generated by wkhtmltopdf, and the presence of external URIs and a link farm points towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=signing+naturally+7-12+unit+10+answers PDF link annotation
    • http://texivej.sportsontheweb.net/74931666950.pdfIn PDF document text
    • https://jajesawi.weebly.com/uploads/1/3/0/8/130813829/6317966.pdfIn PDF document text
    • https://cdn.sqhk.co/dusawugivepo/eQygphc/space_simulator_apk_obb_download.pdfIn PDF document text
    • https://wisufisuzok.weebly.com/uploads/1/3/1/3/131383924/22457eeeec1.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/rGkic7C/62984789236.pdfIn PDF document text
    • http://fesufobototezer.mywebcommunity.org/rolik.pdfIn PDF document text
    • https://cdn.sqhk.co/fezavomol/fjggj68/social_intelligence_verbal_skills.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/ehdifgA/lunozowabesivuzufusukori.pdfIn PDF document text
    • https://zimavilagapiwe.weebly.com/uploads/1/3/2/7/132712623/2785864.pdfIn PDF document text
    • https://sujumakatu.weebly.com/uploads/1/3/1/3/131379709/vukere.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/ijtgchd/kansas_gas_service_telephone_number.pdfIn PDF document text
    • https://jexelokase.weebly.com/uploads/1/3/5/3/135321670/8823471.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/mubemutolewe/how_to_sharpen_staedtler_colored_pencils.pdfIn PDF document text
    • https://e96c6b3a-9487-46fc-b5b9-12e0a216bb3b.filesusr.com/ugd/9b7d8a_8d5b7069014e4051a46dd013c5ee0100.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_178cf288ea90415ebebe945301e73c05.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_60081cfa01fc4d8f8145593fe814966e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zugutixe/audio_song_kannada_movie.pdfIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_38f83cfb0d0e4013980f72ad80b28f4f.pdf?index=trueIn PDF document text
    • http://nakeviw.myartsonline.com/woruzotomebode.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_1667602399524f71824cd14a632d6cce.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_a8ab8a1914314ebcb36db6f1282460af.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_off00011774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11774 5588 bytes
SHA-256: 8059f24a68ef280eef85705c9cf22acb059a14187f978a0495f74f55dc39f1d0
font_01_sfnt_off00012ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB1 12284 bytes
SHA-256: 2b96ec84dae7edeec987641940f53ce84bd13b2646cfafc90dbf446eae0e40fc