Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3a384b5795337f…

MALICIOUS

PDF

139.5 KB Created: 2021-03-09 05:25:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 198bf8769b8d76b88a79c0df000734f7 SHA-1: 708ad0a8d1339f7f30697ba45de2688620c44c07 SHA-256: ea3a384b5795337f2c6b90c959178ebcb6a4fd8b40ddbd52a61e68a7674c9037
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URLs suggest a strategy to redirect users to a network of link farms, likely for SEO manipulation or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=ba+english+literature+salary PDF link annotation
    • http://zopokujejisolan.getenjoyment.net/explain_the_four_required_elements_of_a_valid_contract.pdfIn PDF document text
    • http://rimiripa.mypressonline.com/61663641817.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460066/normal_5fe54a12dc566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_600e01171c693.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419626/normal_60063bbb2cd92.pdfIn PDF document text
    • http://rulabepotinujeb.mypressonline.com/beautiful_disaster_series_download.pdfIn PDF document text
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/derogu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5fd069be6a161.pdfIn PDF document text
    • https://notesorujul.weebly.com/uploads/1/3/1/4/131407176/8916489.pdfIn PDF document text
    • http://timinome.getenjoyment.net/86597977974.pdfIn PDF document text
    • https://witirasa.weebly.com/uploads/1/3/4/5/134525236/zaruk.pdfIn PDF document text
    • https://vobasonuniba.weebly.com/uploads/1/3/4/6/134668907/4711286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465690/normal_5fe6fbefe97e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423431/normal_601cc93f9c013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387565/normal_5fed9bb3a1134.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495849/normal_5ffca58babea3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381762/normal_5ffc59a7528e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417220/normal_602abcf4406b9.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/1d3f467e-5809-449f-90a8-f372289d25fc/56980814804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/328a840d-0b4e-447c-8339-6807e680df9a/wisc-v_subtest_score_descriptions.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_off0001e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E66D 5096 bytes
SHA-256: aa373e5b2eccd62da174c6ebfd0cac8b3e1224ddbb92fd703c2e61cb938e5e5b
font_01_sfnt_off0001f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7C7 11968 bytes
SHA-256: 995c98f42f0366381ba0f8b658ec2a102dcc7f8af457dd58ba70d579f7aef7bd

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