Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad77ed6078a68ea…

MALICIOUS

PDF

80.8 KB Created: 2021-03-16 21:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 039b4d83d6b2f910d89cc5f671c2f186 SHA-1: b231a06800223ef2cbd5468a2c60a1c7a1f27ee0 SHA-256: 0ad77ed6078a68ea5013690eb67cc57602bfd642280337023e2169252f83abec
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external links points to 'https://xajibur.ru/wix?keyword=etextbook+guru+reddit', which is likely part of a scheme to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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://xajibur.ru/wix?keyword=etextbook+guru+reddit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452608/normal_6005820ed17df.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/2925174.pdfIn PDF document text
    • https://rilejaxetikisoj.weebly.com/uploads/1/3/4/3/134391290/f9362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454559/normal_603cb4390426c.pdfIn PDF document text
    • http://letabumo.getenjoyment.net/el_federalismo_en_mxico.pdfIn PDF document text
    • https://mozevosiku.weebly.com/uploads/1/3/3/9/133999333/gewibe.pdfIn PDF document text
    • https://lobusejorul.weebly.com/uploads/1/3/5/3/135338183/peposetegid.pdfIn PDF document text
    • https://lalupapetawosi.weebly.com/uploads/1/3/2/8/132816164/jobimonibifuvalap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405202/normal_5fe813a720de1.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/mozedijiz/wekoza.pdfIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_78b4c3c8107a485695bc48a69970d217.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/jomonomo.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/yo_yo_beep_test_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/disgaea_2_dark_hero_days_felony_guide.pdfIn PDF document text
    • http://nononulavojiki.myartsonline.com/45168467047.pdfIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_409eb664b64447419636d8359c3f8dff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/kuzekukanavugonezodalijoz.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/what_is_a_technical_program_manager_at_amazon.pdfIn PDF document text
    • http://zilowovuv.atwebpages.com/45241319561.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/how_to_be_a_more_effective_public_speaker.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_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 4804 bytes
SHA-256: 59802b481fc30769f45f0809142f70cd228acb9f5edd389d9378616ac9cf944a
font_01_sfnt_off0000f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 11244 bytes
SHA-256: 05d0a7780bddc84f21554758507564c8a223ed38c15bb1c074469afa04626179
font_02_sfnt_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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