Malicious PDF — malware analysis report

Static analysis result for SHA-256 559baf6df36e4875…

MALICIOUS

PDF

70.2 KB Created: 2021-01-06 16:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f8724ee6f0a10fc60eca90b2beb62d3b SHA-1: 971def4faaaffb94a683b09d8d7698df43680afb SHA-256: 559baf6df36e48757d1b080bb2d65efc64c9d317f89b9edfa7858334db7f1980
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to a known malicious redirector infrastructure. The primary malicious URL identified is 'https://gettraff.ru/wb?keyword=centurylink%20corporate%20email%20address%20format', which is used to redirect users to further malicious sites. The presence of numerous PDF links suggests an attempt to create a link farm or to distribute malware through seemingly legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://gettraff.ru/wb?keyword=centurylink%20corporate%20email%20address%20format In PDF document text
    • https://sinisedowinixa.weebly.com/uploads/1/3/4/6/134679082/0c1a3d.pdfIn PDF document text
    • https://cdn.sqhk.co/diwomijo/igjTMhd/tasebevifaxoli.pdfIn PDF document text
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/zonowesozitilum-xelidisemelolu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/rstudio_statistical_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/ascaridia_galli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/018b7d8c-c563-4ad3-812b-efefebafdb9e/4x4_off-_road_rally_7_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d3d047-4355-4cf6-b224-726db5a01438/80768643920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82188196-b660-4003-8645-ae90ddfd53f3/nebopifufeletogosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b1046b7-1889-4d32-b42d-0021b8e89352/79087567568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eb41ad4-b0bf-42f6-a702-08165c8f3896/sixilig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36cc9c1f-0ac8-4d50-9611-f248b1dad94c/lerekafiwawusisuwapujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5bd1e4-2fa1-4d8f-83af-8fffb56da8c3/32882648698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68f2306b-e331-4fcb-94e1-4fe57eeb9c7b/whos_afraid_of_virginia_woolf.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/sheetrock_over_plaster.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_off0000d5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 5372 bytes
SHA-256: b656d591fa918697ad7cd0f44d40c1b5e8d667ff871013cae53589498d5c5edd
font_01_sfnt_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 10492 bytes
SHA-256: 72bf70518f8b4e3986c572a224da376dd926d36f663be94d5bef24273c6d2403

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