Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0b7a4cbc31714e…

MALICIOUS

PDF

100.3 KB Created: 2021-04-02 01:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e13695025e38d82ca661795d96d8241b SHA-1: b4bfcca8656572f3f8fa39fe1ef411ea6a4b2efe SHA-256: 3b0b7a4cbc31714e1b5e8c9c3f8cbce1ba7a06c28ef17ac3619efca6640a91f1
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 0.9994

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://jottigo.ru/award?keyword=rodas+da+vida+anodea+judith+pdf+download PDF link annotation
    • http://fudopajir.iblogger.org/gesumeselemonuvazewokaso.pdfIn PDF document text
    • https://jekomijijupuda.weebly.com/uploads/1/3/1/4/131438685/venezirevuvipamunu.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/ikDdohh/tonulonub.pdfIn PDF document text
    • https://temeromaxuzi.weebly.com/uploads/1/3/4/7/134745627/6e103073.pdfIn PDF document text
    • http://ziximotizaned.medianewsonline.com/59950701620.pdfIn PDF document text
    • https://fifekususelamib.weebly.com/uploads/1/3/5/3/135349053/bebadipon-worezuzof-zawifejini-rezubesewu.pdfIn PDF document text
    • https://cdn.sqhk.co/xororasomig/jbgivwW/puwifamizerevere.pdfIn PDF document text
    • https://lasajiboz.weebly.com/uploads/1/3/1/3/131379041/ponikuzinam-xamezijemaso.pdfIn PDF document text
    • http://gixegiz.iblogger.org/pavupelikofepinono.pdfIn PDF document text
    • https://lipijunozawisek.weebly.com/uploads/1/3/4/7/134721324/judagujaxajin_nodepobesafe_nafeviduza_vaxapazupasip.pdfIn PDF document text
    • https://cdn.sqhk.co/ludibipimilu/RMGJyYp/monkey_shoulder_whiskey_age.pdfIn PDF document text
    • http://bimovixexena.scienceontheweb.net/ejemplo_de_auditoria_financiera_de_una_empresa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://borinalujid.epizy.com/ncert_chemistry_book_for_class_11_download.pdfIn PDF document text
    • http://ruzuvune.epizy.com/kuk_result_b._com_2nd_sem_2020.pdfIn PDF document text
    • http://sajipesexadagon.epizy.com/85359459262.pdfIn PDF document text
    • https://84bc2af4-305a-40b7-847c-8c52cb6b08d2.filesusr.com/ugd/a2e525_14ad7930a2954495a7009d95fc76eb74.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_033782f768bd4436ab383655b033e375.pdf?index=trueIn PDF document text
    • http://dipokufaso.epizy.com/94681250110.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_b890130cffdf4284ba833badd73fb9e1.pdf?index=trueIn PDF document text
    • http://xamawesurasido.epizy.com/tewugomem.pdfIn PDF document text
    • http://lonozixugixapap.epizy.com/51655804985.pdfIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_922a035e5f774ae9ae2e0627bf7e3b1f.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016159.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16159 19752 bytes
SHA-256: e227ba66f07f9ef96793948496d6ef186b7fa403178a804156c62f6a223c7865
font_00_sfnt_off00012336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12336 5268 bytes
SHA-256: b5268383c334f5147994e622c120dc4ec0994f4f14bd9564d16837841490959e
font_01_sfnt_off00013546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13546 15292 bytes
SHA-256: adb4ce2998752cd5f424b4739cbbe37271cb7f8dbce1d435c7d1b4b566b4ef39