Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2765f87c3a74ec…

MALICIOUS

PDF

44.1 KB Created: 2020-10-07 13:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 5b8f23bb166e2ebf28aa498ad0b3194a SHA-1: 428c7da5f8911c656a291a0a487ee364314fddf7 SHA-256: da2765f87c3a74ec3117427fe0e585cf58f35e035d81eda0a8e6a93c35939df7
192 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the URLs, suggesting an attempt to lure users to external sites. The presence of a link farm and a redirector URL points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/strik?keyword=bosch+maxx+sensitive+dryer+manual In PDF document text
    • http://files.rmg.tv/uploads/1/3/0/7/130739309/6477376.pdfIn PDF document text
    • http://files.ericatremblayresumespecialist.com/uploads/1/3/0/8/130874543/zanepofekelo.pdfIn PDF document text
    • http://files.centerschoolpto.com/uploads/1/3/1/8/131858287/1658886.pdfIn PDF document text
    • http://files.elatales.com/uploads/1/3/0/9/130968967/dumunapukije.pdfIn PDF document text
    • http://files.festoonlettering.com/uploads/1/3/2/3/132303024/tetisumupuba.pdfIn PDF document text
    • http://files.rockbottomtv.com/uploads/1/3/0/7/130775735/guxeme.pdfIn PDF document text
    • http://vodokivi.seattleimprov.com/uploads/1/3/1/8/131857112/068d9b3ac1.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/97c660fb-d230-414a-8a25-a3cc0b0e90e4/pivixoguda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8197be17-38b7-47a1-8b2e-a02b0d12db30/42627950813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce5d7c4-5b49-4d0c-9551-0707e280e6c4/82718981975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb094dd-bdbe-4060-a1c4-198ac71e0ecb/modug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b0cd759-2556-49c5-921e-8bd486d73f0a/gefipemarekoxazedix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c94cc31-ab77-42c6-9a02-68a8f6ad35b7/87941077973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf2a5bab-3eb8-49f7-9c84-2418b3e5b132/62965994387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24e9bf17-2931-4e21-beb6-9da04374f6d3/jitivexixazo.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_off00006d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D61 5456 bytes
SHA-256: e27050941e5d006e8377a6b4d3936fb4bc0af8dc3a780447f491569f83cde4ca
font_01_sfnt_off00007fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FCE 10496 bytes
SHA-256: 3ee259ab45c53c695b1aaecc9c71cb69831e2a77be8778494c8e315225cc265e

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