Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3fed1a6071e7448…

MALICIOUS

PDF

74.9 KB Created: 2021-03-17 19:52:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ffe5bf45a7352efb6350621df998bf83 SHA-1: 2c04eb87ef5732b4793a3b45a4f9605fdf2a0c18 SHA-256: d3fed1a6071e7448a5a403c71c101ff651fb002c0e73275e46c428c9fa3f91f2
184 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics, including a critical alert for a link to known malicious redirector infrastructure and a high ML score. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the numerous embedded URLs point to disposable hosting, indicating a link farm designed to distribute malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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/wix?keyword=crest+movie+theater+superior+ne In PDF document text
    • http://lisolu.org/14583036484nqioi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_602ff7bda5af1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493201/normal_5fd0bad120682.pdfIn PDF document text
    • http://pipavomiz.iblogger.org/16152878399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460465/normal_60182c05ed280.pdfIn PDF document text
    • http://vizazovabula.mywebcommunity.org/bluebook_citation_journal_abbreviations.pdfIn PDF document text
    • http://steelsho1.club/datamax_i-4208_position_faultcs2ey.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445544/normal_5ff30cd9882fc.pdfIn PDF document text
    • http://goods-amzon.com/washington_football_team_quarterback_dwayne_haskinsvg5n9.pdfIn PDF document text
    • http://itawegan.space/pefewuvafawekr293.pdfIn PDF document text
    • http://motubudasuvapan.medianewsonline.com/abrikosov_fundamentals_of_the_theory_of_metals.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/fa45a6e5-eafa-45ec-8a45-1ba4d9e11337/popegejadagukizisizaraz.pdfIn PDF document text
    • https://a909b8fe-7c6e-4467-a5b6-92e64a2a5b5d.filesusr.com/ugd/65efca_cbbcc79e11d1498eb359842579c0f59e.pdf?index=trueIn PDF document text
    • http://gupexofuvesok.epizy.com/vonoxewokapaxew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f684e4b-2f98-40ad-8731-9fea4bb5a7ef/21375909912.pdfIn PDF document text
    • http://mamepekavileput.rf.gd/50542694034.pdfIn PDF document text
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_0f10684bff874d889571143b6165b313.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd21c6e4-fa81-4452-886f-88fa8f90f72f/21200059094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c097bc3-ccac-46c0-a950-bf5610c56127/67233375162.pdfIn PDF document text
    • http://fizinesunav.rf.gd/suwiz.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_7d67c15b15404ce6a4fa66e87f8a7b60.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_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 4992 bytes
SHA-256: 2e7c886d2afcdad76e4cc2becaeaa53efb294d8c57b4e1aa07567e7c53442ad7
font_01_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 11140 bytes
SHA-256: 069e2fc586eb77d1e97da5c8e3a3bc1d65cf7c16972f76e710e3d7cb3233bfb7