Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f8fa8d8688b411…

MALICIOUS

PDF

74.6 KB Created: 2021-02-15 16:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 04b219624aad37d70b5170b979dff24f SHA-1: c4b6c96d4b5c6fd84fd049c26447def70bb49dd6 SHA-256: 26f8fa8d8688b411786d704bd74d42eb3704acdaa8d1241c9bc7e65a316ea269
224 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains multiple heuristics indicating malicious intent, including a large number of external links and a callback phishing lure. The document body, though heavily obfuscated, appears to reference 'Air China baggage customer service', suggesting a phishing pretext to drive users to malicious URLs like https://maypoin.ru/wix?keyword=air+china+baggage+customer+service.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=air+china+baggage+customer+service PDF link annotation
    • http://apsdd54gfv.xyz/60009165329y11dp.pdfIn PDF document text
    • https://degevibuv.weebly.com/uploads/1/3/5/3/135316410/4241cae13f4acb.pdfIn PDF document text
    • https://denibemexe.weebly.com/uploads/1/3/4/5/134597338/xujexuluvutiras.pdfIn PDF document text
    • https://retowukiri.weebly.com/uploads/1/3/4/5/134592720/xenepalalowazavu.pdfIn PDF document text
    • http://ulekschool.online/washington_county_sex_offender_searcebn2b.pdfIn PDF document text
    • https://dutilugamon.weebly.com/uploads/1/3/5/3/135301630/2790539.pdfIn PDF document text
    • http://lubozamesorox.iblogger.org/crm_reporting_tools.pdfIn PDF document text
    • http://dreamingdeveloper.com/atlas_de_anatomia_humana_netter506md.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/tobito/transformer_polarity_test_procedure.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/mobile_gamepad_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/eeo_reporting_2019_requirements.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/lagu_always_bon_jovi_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/12549983262.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/intranet_homepage_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/aghorastra_maha_mantra.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_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 5368 bytes
SHA-256: 60cb1d2adcf3ab58a87d6828a9de7fe360f6ae0230cf07621209b65706524694
font_01_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 10568 bytes
SHA-256: a2d88eba8bf27a716c057214a3af4555486846a14f4f73897b46fc21a88355db

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