Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28b56b743a9b488…

MALICIOUS

PDF

79.4 KB Created: 2021-03-03 07:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93149f4c466d8113e34c875264c4f2df SHA-1: 7d17ff5fbaa372b22c9f881052e38c7fe143ba6f SHA-256: f28b56b743a9b4886c3be1f5f63ee9336c81a8705b5b6409049bdd6eca8dbf56
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM'. One of the primary links points to 'https://maypoin.ru/wix?keyword=evenflo+embrace+car+seat+manual', suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=evenflo+embrace+car+seat+manual
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/380bb4558873c93.pdf
    • https://static.s123-cdn-static.com/uploads/4404523/normal_6008a32e08b88.pdf
    • https://cdn-cms.f-static.net/uploads/4404113/normal_5fd9bf860b115.pdf
    • https://movojedafep.weebly.com/uploads/1/3/0/8/130814843/09eab2cd2.pdf
    • https://dofufegudi.weebly.com/uploads/1/3/1/3/131381881/eb8d6039234b25d.pdf
    • https://static.s123-cdn-static.com/uploads/4474759/normal_5ffe1b76a9f7d.pdf
    • https://nuralizowipu.weebly.com/uploads/1/3/4/6/134693001/vufekajijuzuwo.pdf
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5fc65e06ed324.pdf
    • https://vakalebixop.weebly.com/uploads/1/3/5/3/135339933/zunoja-zoxowosetedefe.pdf
    • https://cdn-cms.f-static.net/uploads/4428335/normal_60313d57703a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/nilafafakem/android_oreo_notification_sounds_not_working.pdf
    • https://s3.amazonaws.com/xomudufe/66805602920.pdf
    • https://s3.amazonaws.com/zuniverijesud/57327427723.pdf
    • https://s3.amazonaws.com/nimuwet/weather_report_for_calmar_alberta.pdf
    • http://zuvemodu.rf.gd/94370500331.pdf
    • https://s3.amazonaws.com/zemigiduwagafu/gaxotesilorupo.pdf
    • https://s3.amazonaws.com/boduxatavepe/herstein_topics_in_algebra.pdf
    • http://temomij.epizy.com/fire_logo_after_effect_template_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed99.bin
a8a94e735e20aa9b3683f7fbddd1ed7cfce0ba0b89c84c29413242b2319fa21f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 5016 bytes
font_01_sfnt_off0000fe97.bin
6ae0daae23a0c6b15e355f3112b6280aefe727b29c47eea33c9b51688c8c807e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 10332 bytes
font_02_sfnt_off000121f0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121F0 4324 bytes

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