Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8faee1b4956ac9…

MALICIOUS

PDF

103.4 KB Created: 2021-02-12 00:01:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 74e0b081aff29e6564e14addc180cee6 SHA-1: 2f154d21c976cbd36fa63761d4b23f9dfb81ccdf SHA-256: 3e8faee1b4956ac9ced9bbb95e90060b5a45b3cd53fb54339fe4a5b90bf379d9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically pointing to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The presence of many links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/123?utm_term=effingham+high+school+mascot PDF link annotation
    • http://rovepofaji.22web.org/xosojub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467300/normal_5fd103f372eee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457577/normal_6011be3e584b9.pdfIn PDF document text
    • http://juxeribitu.iblogger.org/45430074499.pdfIn PDF document text
    • https://ziwodenitisal.weebly.com/uploads/1/3/4/3/134350364/xawum-vetotof-bopuvano-luvun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4526930/normal_600f60610850f.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/5022605.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/cXCVqjf/gopul.pdfIn PDF document text
    • https://famopenagunabot.weebly.com/uploads/1/3/4/6/134688774/7100004.pdfIn PDF document text
    • http://ziwegiwe.iblogger.org/77772198800.pdfIn PDF document text
    • https://cdn.sqhk.co/sevalaturi/eQucjaG/vuxodun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_602085c8018d9.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/aJgiIft/blood_c_the_last_dark_castellano.pdfIn PDF document text
    • https://lemidedimiba.weebly.com/uploads/1/3/0/8/130874299/fufusud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/widiku/24123309668.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/95090298919.pdfIn PDF document text
    • http://derekage.epizy.com/vlsm_calculator_free.pdfIn PDF document text
    • http://tokiziguvavu.rf.gd/chemistry_equation_symbols.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/high_school_yearbook_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001422f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422F 5156 bytes
SHA-256: 381da5c7fcb733947b55ff448d05589edb9807631c485ea749df6d8358fb92c2
font_01_sfnt_off000153a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A4 11532 bytes
SHA-256: e71d66a91d6ef01cd5d7917ea1db5ce06767e730a9a33f716c62250703870677
font_02_sfnt_off00017b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B02 16068 bytes
SHA-256: ddba3217f58172b9153fa2e17a6755d454371157efde6935f0723efb148e6ff1

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