Malicious PDF — malware analysis report

Static analysis result for SHA-256 276f78d4a39b8069…

MALICIOUS

PDF

74.4 KB Created: 2020-11-11 14:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c4c2a57f112ed65981e38f7304f96352 SHA-1: f4fac4662ca2f9730c3db9f9254326927778bb6f SHA-256: 276f78d4a39b8069bc84ff2481c43fcccad58550af919b60ad459530fcad6331
214 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics and a machine learning classifier. It contains a significant number of embedded URLs, with at least one pointing to known malicious redirector infrastructure. The presence of a PDF link farm suggests an attempt to generate traffic or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/wb?keyword=the%20guide%20summary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_5f946e04cc7a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_5f8e673ef141e.pdfIn PDF document text
    • https://madajeguruxe.weebly.com/uploads/1/3/4/3/134348767/f99aaf30bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_5f9f278e5926f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474223/normal_5fab943d1e114.pdfIn PDF document text
    • https://dojexivosofu.weebly.com/uploads/1/3/4/3/134348646/02ed43476039548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380675/normal_5fa27076016fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_5f95e82d92e98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_5f8fa69363328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5fa31581565f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_5fa3d040571c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/48738fcc-e791-4b0a-bfe2-7e269c881673/diwitifobavanitorenemane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bfe6eec-8265-47b4-b77e-d01633714d61/21949818467.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/acentos_espanol_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/wavabuvitop.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/conceptual_physics_hewitt.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 4844 bytes
SHA-256: 4872eb0eccbc6221f3a2cb13fd3400ebd361c56f99b97940c3ee5dbff54a9212
font_01_sfnt_off0000eca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 10084 bytes
SHA-256: 24b04b88f2ebe32cb66f59106c0cb7d622f52d7d3594fb3b20de1681eb9a2a0d
font_02_sfnt_off00010ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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