Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92a69f0de12cd8a…

MALICIOUS

PDF

74.5 KB Created: 2020-11-17 16:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b917b606dd12007fd1c8b5dac13ec298 SHA-1: 46c6e11648d0591ef0a8880f0c28cec07ee67cfc SHA-256: b92a69f0de12cd8a1dd0d2c53fd3ca1d11ec094b8f14726b263cb9e81a4bfbc8
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, which is a common tactic for SEO manipulation or directing users to malicious sites. ClamAV and ML classifiers strongly indicate malicious content, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit users by directing them to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?utm_term=natalie+palamides+progressive+commercial+actors PDF link annotation
    • https://jedunaxalow.weebly.com/uploads/1/3/1/6/131606453/wanojefabijifajiva.pdfIn PDF document text
    • https://pebewaviwukak.weebly.com/uploads/1/3/4/4/134463457/kedowujow.pdfIn PDF document text
    • https://vuxojamobepu.weebly.com/uploads/1/3/4/3/134333522/3054189.pdfIn PDF document text
    • https://giginepa.weebly.com/uploads/1/3/4/3/134389182/eba7fce.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/xegupof-pajun-wemimimof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_5fa5e62793557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5fa7b0c548015.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/nakafoxekasile.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/jebokizez/ranikufebi.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/9.8_meters_into_feet.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/unblocked_search_engines_at_school.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/8021921827.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/37897446510.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD7 5424 bytes
SHA-256: 11a857e7a1f3621d0080b402bc5bcac87d4a3afa3e85f13bc32d45add0b4eed8
font_01_sfnt_off0000de3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3F 12768 bytes
SHA-256: 9e163fa648158317bf13c0f9ecc719438e6fd192ada140ad039ce5a948ad85c1
font_02_sfnt_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 16544 bytes
SHA-256: c64f975c7c74378765a15e192890ba001b575443647995d4109c17b56814fb1e

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