Malicious PDF — malware analysis report

Static analysis result for SHA-256 39979fcc8b657a9c…

MALICIOUS

PDF

86.3 KB Created: 2021-03-15 16:00:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e9b6605a11fc34709fc957c13f552921 SHA-1: 5bbba4bf35c6606776af0c1193e8f287204c21e2 SHA-256: 39979fcc8b657a9ca9c53b80ace1807ef5af9918839b8ecefba7086a2ff9af9c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

Heuristics 5

  • 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 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://crophysi.ru/strik?utm_term=how+to+make+a+children%2527s+market+stall PDF link annotation
    • https://cdn.sqhk.co/kibutonap/gcijxWy/munuwasujaridakodowe.pdfIn PDF document text
    • http://wovewor.iblogger.org/82292407737.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386080/normal_5fdfcb7a251b1.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/d6hinK3/flappy_dunk_score_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/fitijusepako/jcibjik/parks_australia_kakadu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476152/normal_5feca10449c01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366036/normal_5ff0c9ed9e73d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497650/normal_602d97d201c5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuxekijonudi.epizy.com/98712096168.pdfIn PDF document text
    • http://dusiwesidixe.epizy.com/balefodivajemosuvorinew.pdfIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_8953ff5ce8e844d7a493cca962321adc.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_97c336357ea24d43a965488e950d116f.pdf?index=trueIn PDF document text
    • http://vabibago.rf.gd/permission_letter_format_for_college_hod.pdfIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_ac1da950af2645dbba9fdd0a5c977af5.pdf?index=trueIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_724d0cebec0e45f1b23f9848442a649c.pdf?index=trueIn PDF document text
    • http://tokipobobanokab.rf.gd/fozabezit.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_a7f3f89743924b1ebb2f58707b21a9d9.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 5328 bytes
SHA-256: 2df3e195dbc6e2243642d48fe87fe6d0230804f1755e9b93ad459096bc73084f
font_01_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 5276 bytes
SHA-256: aaf7c4b061f554e6046deffa6d4f05a28794b40ece22470790efd7949b12f20a
font_02_sfnt_off00010e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9B 11240 bytes
SHA-256: 4558f4112301dba7da01a3dae96e1fe72d96348e002a1f13f2e7fa4a22f4fa1d
font_03_sfnt_off0001351f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351F 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939

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