Malicious PDF — malware analysis report

Static analysis result for SHA-256 a239cd7252212c9f…

MALICIOUS

PDF

103.9 KB Created: 2021-04-02 13:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7b1b29e1e426782bea55baae9f52b126 SHA-1: 5521f50b8729d26d1367cba68921125aa1c1e81b SHA-256: a239cd7252212c9f1e844b9ea6bf94e30df22e04ecf1e849029107a1ec2a6be3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://seumenha.ru/award?keyword=cranial+nerves+and+functions+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447084/normal_6050796a5b7db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459628/normal_60143cbcb35f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_fe2a7c54dab240eab573be10cf103690.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/punurum/hashar_film_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/kusalilipagadan.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_b0601bd8a20c4220b7852e99fd2663cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bagisi/nevakamanajogedakilukafir.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/tresca_and_von_mises.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_f94646de4ca94279af6785ac12fba447.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_d16356538a9f4264b6a99433b299e402.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/39978568009.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/53384623848.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_f41a4fac49ee44c196b3c16bcce3d230.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/jupejus.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/89033860343.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/23315932726.pdfIn PDF document text
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_e337c3d9f68c4c329fc899deeebb90a6.pdf?index=trueIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_07e57fbf96984b9a8aa1930bf6edce36.pdf?index=trueIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_8bb080c0e365479aa34fdcac1b28e771.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zikeko/facebook_cover_photo_size_2018_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/android_studio_apk_for_pc.pdfIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_0c3a7a7e8f7245c6831785e9f2592445.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/79697472142.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/junajeda.pdfIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_dc7511fc2f7e4c81a544ee1d6e7a8d81.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_off00015c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C8D 5116 bytes
SHA-256: 74265d3e2f7fc8fa47f04003d00fcbf058c8b0012edc1cda1a459065afce5d5c
font_01_sfnt_off00016e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E08 10388 bytes
SHA-256: 6236bef17cd199376332b961b941ee41c851119a64f863db2359fef3c00b3cb4

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