Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5d3498c22f4da0…

MALICIOUS

PDF

105.5 KB Created: 2021-06-05 22:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a3f95953e230a18f2baf6d9e759a4ba SHA-1: 6cc87fd8d7f7f8be5fc7f181df89880edd6fa177 SHA-256: ec5d3498c22f4da0710c74a230798f97dd343a37b399a47d8e16e67c3a1851d2
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external links, with one prominent URL pointing to a site that appears to be part of a link farm. The document's content, though heavily obfuscated, suggests a lure related to job searches or payment instructions, aligning with common business email compromise tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://irlanc.ru/pbw?utm_term=covid+testing+rn+jobs+near+me
    • https://cdn-cms.f-static.net/uploads/4371267/normal_6011206ee3c75.pdf
    • https://rakoroga.weebly.com/uploads/1/3/4/8/134887340/1c069f30.pdf
    • https://sadoxeliwuduw.weebly.com/uploads/1/3/4/0/134040540/5691187.pdf
    • https://cdn-cms.f-static.net/uploads/4390385/normal_604469b738bb4.pdf
    • https://static.s123-cdn-static.com/uploads/4380088/normal_5fc6a1630e238.pdf
    • https://gesamuju.weebly.com/uploads/1/3/1/4/131453574/a9bfd8c8.pdf
    • https://jukovuwivoxufab.weebly.com/uploads/1/3/3/9/133997180/xelid_konezoreta.pdf
    • https://cdn-cms.f-static.net/uploads/4420030/normal_602e198a7a52d.pdf
    • https://cdn-cms.f-static.net/uploads/4368230/normal_605715cf94fb0.pdf
    • https://cdn-cms.f-static.net/uploads/4488572/normal_5fd9370b29f11.pdf
    • https://static.s123-cdn-static.com/uploads/4390637/normal_5fdfacc424dcd.pdf
    • https://lutividagij.weebly.com/uploads/1/3/4/8/134896544/a5079b29f620ad7.pdf
    • https://cdn-cms.f-static.net/uploads/4380536/normal_601837777c52a.pdf
    • https://static.s123-cdn-static.com/uploads/4403805/normal_5fc74f6911a96.pdf
    • https://cdn-cms.f-static.net/uploads/4491936/normal_600b65549f257.pdf
    • https://cdn-cms.f-static.net/uploads/4485714/normal_601d3f407fe13.pdf
    • https://rawitexebava.weebly.com/uploads/1/3/4/4/134487877/5703840.pdf
    • https://tigizojotajubum.weebly.com/uploads/1/3/4/4/134489046/zulufapodolebe.pdf
    • https://cdn-cms.f-static.net/uploads/4424025/normal_6035b578c9aa7.pdf
    • https://sezorataxij.weebly.com/uploads/1/3/4/6/134600708/vekipokik-puduvifinuluzej-zagojububu-pufuwevawesisi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bovozajezo.pbworks.com/w/file/fetch/144440517/gufiwuxan.pdf
    • http://javefanudosa.pbworks.com/f/python_tutorial_for_beginners_with_examples_free_download.pdf
    • http://rugewenuzed.pbworks.com/w/file/fetch/144426432/79371816970.pdf
    • 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_off00016095.bin
613379e6017343f3375b58ed710e8a0da9249a6996ce3df8ffd77a735759e7ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16095 5296 bytes
font_01_sfnt_off00017286.bin
6457f668b7cbc6e633371ff89d63d4332624245635e7c056fff482924172a7bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17286 11068 bytes

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