Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d7f4b0542d716f…

MALICIOUS

PDF

77.8 KB Created: 2021-05-18 02:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 21f305f7811c05af312c99a7daf7ac01 SHA-1: 521244d8ca9da7fe5602b425647b7d1313b0d8a8 SHA-256: a2d7f4b0542d716f52c6264a52138fd33f9f989f7a9f55abcfd60cc29aa2c629
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to potentially malicious redirectors and link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious. The embedded URLs suggest an attempt to direct users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=evaluation+se+deplacer+sur+un+quadrillage+ce2 In PDF document text
    • https://fukimeremunosav.weebly.com/uploads/1/3/1/3/131379236/bugomapetepe.pdfIn PDF document text
    • http://perakaganiw.iblogger.org/fisoduda.pdfIn PDF document text
    • http://zakilifawurafed.22web.org/gidiwijon.pdfIn PDF document text
    • https://nupuwuzom.weebly.com/uploads/1/3/1/4/131438231/razazovap.pdfIn PDF document text
    • https://mejapibidar.weebly.com/uploads/1/3/4/3/134315264/4866593.pdfIn PDF document text
    • https://jolofoni.weebly.com/uploads/1/3/4/0/134042869/0cda9b80.pdfIn PDF document text
    • https://soputepitup.weebly.com/uploads/1/3/5/9/135973261/b5881082.pdfIn PDF document text
    • https://luwibizikowar.weebly.com/uploads/1/3/4/4/134483868/8c7d815e641.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446782/normal_5ff1865c5be5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450047/normal_605f5bcb553d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407304/normal_6041fd718689c.pdfIn PDF document text
    • https://rovividupezudu.weebly.com/uploads/1/3/4/3/134373795/744ee5a878ba69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403259/normal_5feb4b1cce198.pdfIn PDF document text
    • https://fupakukenig.weebly.com/uploads/1/3/4/2/134234610/gusuwukug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451757/normal_5ffb11e99b0d3.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/jotajawudujo_tefora.pdfIn PDF document text
    • https://jadomuvifaxa.weebly.com/uploads/1/3/5/9/135960305/pakuguromemove.pdfIn PDF document text
    • https://puzawijusikari.weebly.com/uploads/1/3/4/1/134131266/69c55c0e7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c97bc131-405b-4a6a-bb81-353ac8c2ec0e/zixewid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5daafbe5-32cf-4893-8108-ebeaaf77f733/cuantos_ladrillos_hay_en_un_metro_cuadrado.pdfIn PDF document text
    • http://xifusejikudit.rf.gd/ditavotalupepa.pdfIn PDF document text
    • http://divifafapinuk.rf.gd/vadomaputizejatonevuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11644436-9eaa-4e3f-aff0-7923c1041790/26258539206.pdfIn PDF document text
    • http://wulogakuzi.rf.gd/catfish_farming_proposal.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 5516 bytes
SHA-256: 52f2907497922d74c82201b8549655ee0de1c1e655c567435fccda00cdcc4167
font_01_sfnt_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 12020 bytes
SHA-256: 3e2c6fe46d8c843e57bd171b2c6b53aba607ded99e4fb0a31cdd08575c3764d3
font_02_sfnt_off000111bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BF 16328 bytes
SHA-256: 586506f7825e99e8ad2dc8931b18d7b3ba31dfac5884eabe0521ca8eba033fe0

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