Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31148704bbced2d…

MALICIOUS

PDF

72.7 KB Created: 2021-03-21 22:32:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8b705bb339447c2239a45ba85ff1a8a3 SHA-1: 5f4cf9f77cec4184139b7438eb319bd65a6c6ba9 SHA-256: b31148704bbced2de341ac8672f5509053ec21ab439a4b1fbc674adb5ada197f
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://resalured.ru/strik?utm_term=equations+with+variables+on+both+sides+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/sadirorig/Igiwecq/knights_templar_and_the_holy_grail_history.pdfIn PDF document text
    • https://xabomipa.weebly.com/uploads/1/3/4/4/134484571/1288622.pdfIn PDF document text
    • https://sobiwololisa.weebly.com/uploads/1/3/0/9/130969717/2aa5f7adefed48.pdfIn PDF document text
    • https://goreduve.weebly.com/uploads/1/3/2/7/132740848/7537140.pdfIn PDF document text
    • https://damuduwanilew.weebly.com/uploads/1/3/4/4/134477354/c595c675e11038.pdfIn PDF document text
    • https://cdn.sqhk.co/wemofisejaf/geji7hj/mopagepumugaxisijatudev.pdfIn PDF document text
    • https://cdn.sqhk.co/sugefixa/icOF9gd/world_history_project_three_close_reads.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/iejUifB/49311432194.pdfIn PDF document text
    • https://lajisoxe.weebly.com/uploads/1/3/4/4/134435468/fodevapeluv.pdfIn PDF document text
    • https://fereganew.weebly.com/uploads/1/3/4/1/134131887/venox_lakolosazilig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a04f01a-7147-4793-98aa-b59dc93e6f96.filesusr.com/ugd/efcdeb_be2268f99c1f4c49af677a56865587ac.pdf?index=trueIn PDF document text
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_47c1866ae45449d0b00bf0b2e27d6bf6.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_7f50b44250c442168ec5f62ba3a40f60.pdf?index=trueIn PDF document text
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_9e12d77335fc48258a7867d5cb2f6a80.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/awol_at_guide.pdfIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_19914d5607604ab79150682edf7b8a83.pdf?index=trueIn PDF document text
    • https://9f2a6cc1-6e15-4467-beaa-57274ca996ed.filesusr.com/ugd/78f4c3_f2e0ae1a2df742eeb48a1c40fc35fb03.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/vijegosevik.pdfIn PDF document text
    • https://9dc8676a-0e58-44ee-a512-e339c7094702.filesusr.com/ugd/7c0652_1aeaad383d574693ae3c6a9f222d24c9.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_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 5352 bytes
SHA-256: 8288269df563615e8f569407daf8453d637c1d4d23ca19b156cb776ca2580e6b
font_01_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 10724 bytes
SHA-256: b59b14b6688abaaf91bee781f1e13a4bd4803e0937b4fb8fc5152d92097929ba

Open this report in the interactive analyzer, or submit your own file for analysis.