Malicious PDF — malware analysis report

Static analysis result for SHA-256 211bc1ebf2e24a72…

MALICIOUS

PDF

68.6 KB Created: 2021-02-15 17:00:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2e15f9a025fa4f869be7f4aafe8e1348 SHA-1: 8c19e85fbf3860a02ff1780991f7e3b46cecb9f5 SHA-256: 211bc1ebf2e24a72f3e15f59a4d3c07dac07a821905acc2bbcc251be486d22cb
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The PDF structure and embedded links suggest it's part of a spearphishing campaign, aiming to lure users to malicious sites.

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://leonvi.ru/strik?utm_term=personal+pronoun+worksheets+grade+4 PDF link annotation
    • http://kifenefazujiz.iblogger.org/kuwugijunigunemomutame.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365562/normal_5ff86def0b76f.pdfIn PDF document text
    • http://banolapisa.iblogger.org/62936223675.pdfIn PDF document text
    • http://wazixusazajafem.22web.org/kafewutotufigetiduvaxu.pdfIn PDF document text
    • http://zoompol.xyz/17508875182ri3b1.pdfIn PDF document text
    • https://katodelof.weebly.com/uploads/1/3/6/0/136051175/62d970b8427016.pdfIn PDF document text
    • https://kazawiluk.weebly.com/uploads/1/3/5/3/135384823/9c1c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_6018f7a8e7c98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459320/normal_5fca4b191025b.pdfIn PDF document text
    • https://durafozo.weebly.com/uploads/1/3/0/7/130740533/ac5c0bffdf772d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402481/normal_5fc9e97f983a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487184/normal_602a51e1350e5.pdfIn PDF document text
    • https://bibutijelogoper.weebly.com/uploads/1/3/2/7/132740620/najisatirul.pdfIn PDF document text
    • http://igcopyrightforhelps.com/jivixok5wair.pdfIn PDF document text
    • http://bigpleasure.ru/siwaluyonhf.pdfIn PDF document text
    • http://susurrus.space/gunner_stahl_portraits_bookccpqx.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/zevutebulaworel/bihar_tet_application_form_2020.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF18 5464 bytes
SHA-256: 9ef9c0c95f1e1f504c3d25e36b8540d4acb64a4a2172e35beb33844b6efc6785
font_01_sfnt_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 10492 bytes
SHA-256: ebc54268f4895d84af804946e4bfa562e9597e342216b3609d5eaf7985175138

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