Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c790eb8b1a6082…

MALICIOUS

PDF

66.2 KB Created: 2020-11-17 16:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1541f95b619afd518089e2c57a72e7c9 SHA-1: 228949293ffcbc0967185a008dc6da627f939fa1 SHA-256: 38c790eb8b1a60823f31ee21ef542d1dd0557f4e0dc7a765ce1d792f2be96119
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to known malicious redirector infrastructure. The primary URL, 'https://traffking.ru/strik?utm_term=kald%25C4%25B1r%25C4%25B1mlar+%25C5%259Fiiri+fon+m%25C3%25BCzi%25C4%259Fi+ve+slay', is flagged as malicious. The file's structure and the high ML classifier score indicate a deliberate attempt to lure users to harmful sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF's nature as a link farm suggests a T1059.007 (JavaScript) attack pattern if any embedded scripts were present and active.

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
  • 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://traffking.ru/strik?utm_term=kald%25C4%25B1r%25C4%25B1mlar+%25C5%259Fiiri+fon+m%25C3%25BCzi%25C4%259Fi+ve+slay In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5f874d4607bae.pdfIn PDF document text
    • https://bipinutafo.weebly.com/uploads/1/3/4/3/134358532/5138204.pdfIn PDF document text
    • https://rifodomofakape.weebly.com/uploads/1/3/4/6/134627700/bipowurupid.pdfIn PDF document text
    • https://wupuvogobed.weebly.com/uploads/1/3/4/5/134507139/e227b979c.pdfIn PDF document text
    • https://mereduje.weebly.com/uploads/1/3/4/7/134751500/depovamebe.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/zigabituxefepi_vumuwusevoriku.pdfIn PDF document text
    • https://forunevelaviwa.weebly.com/uploads/1/3/4/3/134392474/sisuziwemomefugidiv.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/1fc1e0a1-be7a-4c7f-8e02-9c74da4b6c67/what_if_its_us_book_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/35866051780.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/washington_state_history_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dbd4077-38c1-4929-8389-70f1c4c07f58/65562028347.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/76537114574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d3b7426-d339-45dc-bdfb-1bc9ad09d472/minecraft_opifine_download_1.12.2.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC064 5864 bytes
SHA-256: 186dde32e5a9e2c56aad3c2f22ea4a27ba774400018316ca2a1b5eb9fec028ed
font_01_sfnt_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 12264 bytes
SHA-256: afc7126be5cf96fb8a7260a1ada18ee30daa5d81332157604e0ae41ce885609d

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