Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d8c9cc18ac33de…

MALICIOUS

PDF

73.8 KB Created: 2020-12-10 06:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a3d8a9891ba4b28c9323056512e0fcb2 SHA-1: 98a940682d64174748fb5aec8daff60bc4452926 SHA-256: a8d8c9cc18ac33ded576b81a60ef816e6e7eecad00fa1251cd30fa77089148e4
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 0.9998

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://trafffe.ru/strik?utm_term=handbook+of+applied+behavior+analysis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403689/normal_5f922bf556952.pdfIn PDF document text
    • https://mijibetifud.weebly.com/uploads/1/3/4/6/134653630/tadodidozibarorari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378621/normal_5f93deae1f9e6.pdfIn PDF document text
    • https://wugovokida.weebly.com/uploads/1/3/4/3/134319073/49f7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc4cb0188c99b6d37c032fb/t/5fd00d94055cc35c686f9bef/1607470485440/vunotunezalulizisunoruf.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0be02cd1e280355d3720a/t/5fc2fccf2dd96f591850ef1e/1606614225985/zefofapekuxesifevimepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef737cb-2a36-45f5-b592-0466e7244cfd/93415635880.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc33129affbf90a66f953cc/t/5fc3c7b56457125654af3429/1606666166010/tigimezavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cceef05a-e7e6-453b-9475-ffc9a2246575/89440926259.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/91402239022.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5bb0acd1e280355f54485/t/5fc704f3e2dcb1274de4aafd/1606878452197/soul_hunters_pets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ab954e7-1971-46e6-8b0d-8ef41658146d/63273099565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cab1910-505e-4bcc-a40a-6fab0dd29dab/radunuvipodibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1303bce2-9eea-47e1-aad9-a886218b5e3f/longs_interaction_hypothesis.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc525d588c99b6d37c2e2ed/t/5fcdca3624c49707d33fdf4f/1607322167887/bd_recharge_software.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc27d7511f6a419848fbf13/t/5fc69b644e98326c02f9d8b6/1606851429062/vikuvoxivifafevukos.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/surelivomilij.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD523 5164 bytes
SHA-256: 71d87c7a6b3a1aa430684bdb9db5d7204afdfe3829fb4e4ed502b988930f8b5a
font_01_sfnt_off0000e69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69F 10848 bytes
SHA-256: 776c8fcf311b330938642b8b47e2b4c67fee29d2c1bc4c99d630bff0025397f0
font_02_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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