Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d8cdddd4856f12…

MALICIOUS

PDF

77.3 KB Created: 2021-03-28 14:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 63053cd7f208c0675aab57e4de9b5a9a SHA-1: 0853305fd2d9718e1c315af6caea3d8db7469531 SHA-256: 55d8cdddd4856f121d167e0a91500c2ffa9cf18eba5027bc81db2d0d2a0ba42b
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, with a specific heuristic indicating an advance-fee scam lure. The document body, though heavily obfuscated, contains text related to 'How to pray in sunday service' and references 'wkhtmltopdf', suggesting a deceptive pretext. The primary IOC is a URL hosted on 'jottigo.ru' which is likely the destination for the scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://jottigo.ru/strik?utm_term=how+to+pray+in+sunday+service PDF link annotation
    • https://cdn.sqhk.co/fogobewataja/hjphdI2/xovizolulukozorisesare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483089/normal_600ce0980081d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384164/normal_5fe3170a2bb27.pdfIn PDF document text
    • http://nefodela.22web.org/does_samsung_tv_nu6900_have_bluetooth.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489717/normal_60534e8186b07.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvidomanale/h5hdNMs/38042726505.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477877/normal_5fe393a074532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427104/normal_6011d638a0ce6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://712e085e-8422-4094-ae2e-709d430f1fc9.filesusr.com/ugd/bf8edb_976a752702a9483e8e42e014e98dcfe9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/24850761670.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_3020139976524911b2195be33cd9e03a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pujirageg/mathematical_analysis_apostol_second_edition.pdfIn PDF document text
    • http://jeburam.epizy.com/malayalam_movies_collection_movie_moviesda_isaimini.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_ec9f094206d04ea297a791395824ed01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/angular_6_form_control_dropdown.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_09ddafac401a48718ce69be198cdba05.pdf?index=trueIn PDF document text
    • http://soxalisaxofaba.epizy.com/best_budget_android_phone_canada_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/decolonizing_the_mind_introduction_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/jitikofiwigakubo.pdfIn PDF document text
    • http://sojefebil.rf.gd/68901097212.pdfIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_242eb1ba08e54376a914c26b3ba42a59.pdf?index=trueIn 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_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 5248 bytes
SHA-256: 8e44ae48fd40a1d728c35afff7b6e34ffd4cf1247fbdd53b4e66f8c5cbcb5d70
font_01_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 10252 bytes
SHA-256: f36d45cee58b96f6efd3e07bf0364cf2dd0a38c6dd342a7b059124e5f208c854

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