Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ff128abe495aeb…

MALICIOUS

PDF

73.4 KB Created: 2021-02-18 12:00:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0cd2b027980699bcdf83fd6932f29f88 SHA-1: b2244964a95ad76f665810242f9fb9c5b012a4ee SHA-256: d5ff128abe495aebd3dffdacc3c47583b67ab56cede9b360618ec167936e1ce2
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://jacksth.ru/strik', which is likely part of a phishing campaign. The document body, though heavily obfuscated, suggests a lure related to 'Amazon interview answers', indicating a social engineering attempt to trick the user into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=why+amazon+interview+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464056/normal_602b8673c4f81.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/iikgjge/dotazelafazakobe.pdfIn PDF document text
    • http://xruhdfo.site/how_to_manually_update_android_tablet_osjzc6p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374835/normal_5ffb8baa04a98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389581/normal_6007b02d528e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_6022ffabdb787.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/zak8Vgf/vixulusuro.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/ARhiNtB/87627463475.pdfIn PDF document text
    • http://kinokaiff.space/vibiwisawajryt.pdfIn PDF document text
    • http://in-arenas.com/xegugokepegedategq7ct.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/agiijgu/basotixogidovogabineg.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/gcijght/bake_keto_snacks.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/mexavofezoxi/bal_hanuman_movie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/fuvezopumotavekubit.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/55375116002.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_off0000e2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 5208 bytes
SHA-256: 02d4b828057e2d55506ad15a842c14ea268aa1db09ad7d7552450cee8011aef9
font_01_sfnt_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 10756 bytes
SHA-256: 6c9415260e72c98b785237033318131021f817cb2dfd4f0a1a180d569f576c8f