Malicious PDF — malware analysis report

Static analysis result for SHA-256 731f6929e9ea0c3a…

MALICIOUS

PDF

79.6 KB Created: 2021-04-05 02:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3085481ba3b17b72f850cbc1ea4d98cc SHA-1: 4adf21ac6348d871ff5726379417d78e2a13a009 SHA-256: 731f6929e9ea0c3a8a46b3eb8268cdc030e17017a7166661520e6ae1dddcc1c5
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=nerve+book+main+characters PDF link annotation
    • http://napowojeba.medianewsonline.com/wapike.pdfIn PDF document text
    • https://gogesatita.weebly.com/uploads/1/3/4/3/134321397/mowukiromomu.pdfIn PDF document text
    • https://sugovodeko.weebly.com/uploads/1/3/2/6/132681033/xitasar_zikaworaw.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/assessment_methods_in_education.pdfIn PDF document text
    • http://imedo.ru/parquet_courts_human_performance_liveig8wn.pdfIn PDF document text
    • http://clientbluebadge.com/synonyms_pub_quiz_with_answers83uac.pdfIn PDF document text
    • https://gobewuguwug.weebly.com/uploads/1/3/6/0/136056794/nipidirusux-womafatasoxanup.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/pune_city_detailed_map.pdfIn PDF document text
    • http://axecheat7.xyz/crusader_kings_2_cheats_army_sizeysm0k.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/78551611914.pdfIn PDF document text
    • https://vavujajakakef.weebly.com/uploads/1/3/0/7/130740385/kutitafasexi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_c1186bb4b35c4bc5a3648cf42cf06ce8.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_2f0c29d340394b08b7131b18457ec499.pdf?index=trueIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_569162bdc9524a27a34be20a7930fa0c.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_380e648733894b17bc8170d53e0fe8e7.pdf?index=trueIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_4b365d8a5a3742ee99b696c014720966.pdf?index=trueIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_f9f5f3a3ac0d44feb0c6a4125eb6c718.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_af3ad5452f1d476a8fe5c29dcf4ed0d0.pdf?index=trueIn PDF document text
    • http://xobebol.onlinewebshop.net/tixumupapodis.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_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 5240 bytes
SHA-256: 07cef0f1788754623389225953778b4faccd8f6811ec5605cf736779038e2146
font_01_sfnt_off00010b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7C 10632 bytes
SHA-256: ac79f8a3acbc193098e2e9379f53c4d9edfce7014c0897b857bcc698c220cc64

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