Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7364006c929c0a7…

MALICIOUS

PDF

73.1 KB Created: 2020-12-24 22:09:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 642696f8de22efbae739103695149f6f SHA-1: ccebf2f76ffcb2dffc28ddd473ac3a154675f8ab SHA-256: d7364006c929c0a79393d375ed5ce6bb1b99091e4582cb7772ea0503c0091025
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a 'chain reaction pc game'. The presence of multiple external PDF links, including a link farm, indicates an attempt to obscure the final malicious destination and potentially distribute further malware. The ML classifier and ClamAV detection strongly support a malicious classification.

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
  • 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/aws?utm_term=chain+reaction+pc+game In PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_5fbedb0ad8f83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5f91e083ed2ab.pdfIn PDF document text
    • https://fuxogadukuka.weebly.com/uploads/1/3/4/6/134688721/fofojufizid.pdfIn PDF document text
    • https://zagusopiv.weebly.com/uploads/1/3/4/2/134234894/xilupitepejod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482215/normal_5fc38b551afa7.pdfIn PDF document text
    • https://sijilosak.weebly.com/uploads/1/3/4/4/134476358/2778600.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/22fa226f-ae8f-46c2-8dad-8e29a69917cf/74641851607.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/labopewipuvoremufepufap.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/pobizixumusudegov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7f4dd86-7e42-492a-87bc-9e1517e17c0d/challenger_le10_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13119373-ec9c-4f88-a834-055d85fd06dd/webipaxulozewodof.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/edgenuity_integrated_math_3_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/typhoon_hagibis_news_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/jopemed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a17abff9-b6f2-47e1-b61e-f4ac83cd55b3/71349533939.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_off0000e297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 5044 bytes
SHA-256: dc73c2027109dabc32c2d69e91aecbbc3a5b114b834028ce9c3b30deb46f1df2
font_01_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 10520 bytes
SHA-256: 6ccbe6228a6b46d3edb046ca251324d6b52773338bf972469f530057dda5fb85

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