Malicious PDF — malware analysis report

Static analysis result for SHA-256 82aafcbfc417dc27…

MALICIOUS

PDF

77.1 KB Created: 2021-03-18 07:05:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1cf87b9a44baa3b8ca4ccf121bc22f3 SHA-1: 25085495b4768d4e2ad69071a0fdd3582eeeb358 SHA-256: 82aafcbfc417dc27b266a685ce0a6bdde1eff1781e899b324d0c70e2b76e4f03
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with one identified as a potential link farm. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to malicious content, possibly for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/wix?keyword=sybil+flora+rheta+schreiber+pdf+fran%25C3%25A7ais
    • https://static.s123-cdn-static.com/uploads/4469863/normal_5fe2ed74e72e6.pdf
    • http://wonder-ita.fun/best_good_night_moon_quoteseui1v.pdf
    • http://legalvictory.group/3909163781474d3c.pdf
    • https://cdn-cms.f-static.net/uploads/4411714/normal_602658c4cc657.pdf
    • https://cdn-cms.f-static.net/uploads/4384036/normal_603410201e9ad.pdf
    • https://cdn-cms.f-static.net/uploads/4421048/normal_6031641c0b480.pdf
    • http://gamedv.design/jasinigurcfc5.pdf
    • https://static.s123-cdn-static.com/uploads/4460076/normal_5fcaf37a76ca7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_24dcedadcc4948038c44f5a41a9eda89.pdf?index=true
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_85aca6383a59464cb5b50dcb0eebaedb.pdf?index=true
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_2956681de9d848f180f5e238ff6aac8a.pdf?index=true
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_9d2c52325e42425293e65af85e884e9e.pdf?index=true
    • https://2a26c5f8-c4f8-4af8-830b-7e2c9961bd8e.filesusr.com/ugd/2e4362_4748e26363e6477a91f53a7538298295.pdf?index=true
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_5797541848ae42cf8892265385fa7080.pdf?index=true
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_6db14945cf404d00b1954a67422cb59f.pdf?index=true
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_fbcfdcef7c594f45881fe1b6c2d3b480.pdf?index=true
    • https://c751e6e8-0850-424d-b14e-d7ae46260796.filesusr.com/ugd/bc1028_7f10af68fb514a8c84f3364ebc273f34.pdf?index=true
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_eed652e9bd0a4b83b5e164bc31c15749.pdf?index=true
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_3c8eea5b340647f2a9362efae714a546.pdf?index=true
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_162e7a1754aa4b0d97539b781a013d71.pdf?index=true
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_7c0cf6af51284d109687dc3dcc4b149d.pdf?index=true
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_7ae9b8d82be0419b9a2588f086adf038.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e74a.bin
136773b46d3ab8189bf7b86ed10f6c40c5feb449efe62f4b4badd900cb91d840		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 5772 bytes
font_01_sfnt_off0000faa3.bin
fc75f00ec5f52eb5d0149ad7b4358b37aa9a6eb60627921c84fae88abf4705b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 13008 bytes

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