Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be2724e987742e8…

MALICIOUS

PDF

80.7 KB Created: 2021-02-14 01:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 85f65ddd3b26b4f9a779051e56e319fe SHA-1: 30725c02fcf3888aab05adc13afa0be5de81a915 SHA-256: 4be2724e987742e88dcd3cf3a6bf9f60c4728840b0ac8fff3d636b6f4cde4693
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers', aiming to trick users into clicking the malicious link.

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/wix?keyword=body+trek+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/kugefiruxat/hggiifE/luzituxowataruruxunug.pdfIn PDF document text
    • https://cdn.sqhk.co/waxolulum/d4ohfid/jikipedilufelimavejasil.pdfIn PDF document text
    • http://indir-kazan.com/bingo_5_lotto_numbersg6xuj.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/G3ica0Q/pazubetesekowukowexafar.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/e60gjib/zafozizidiwumazo.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/hbPijU1/traffic_moto_racer_highway_rider_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/rirerujel/iWjeLzQ/rise_of_empires_ice_and_fire_legion_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/eXiihbE/dead_mind_tattoos_doreen.pdfIn PDF document text
    • http://antonioita.fun/hamilton_beach_stay_or_go_crock_pot_instructions1i6sv.pdfIn PDF document text
    • http://duplicwcnj.space/fejaxuvuzawzjv0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mozedijiz/vikupugosumudag.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/pubuvopemenexofajobebo.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/land_rover_defender_90_parts_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/google_chrome_free_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/17289556238.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/9211711140.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/goggles_lens_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/bob_marley_albums.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/42593405743.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/79064237165.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 4928 bytes
SHA-256: 50fa69426d940b015b77f197111eb8c6987c4e2d6029f0218a19257a42510b67
font_01_sfnt_off00010459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 10224 bytes
SHA-256: 33f0d2e3f60b5e26d3c03590300ac34ef60fb7535ba0ea332e22c6670b37111b
font_02_sfnt_off00012759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12759 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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