Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52fe21963267ed1…

MALICIOUS

PDF

80.2 KB Created: 2021-04-06 21:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5e9f07487fdc95c4b2f0fb88d556100e SHA-1: 848188f78e6b1f57a2d7f04e54cac250849de833 SHA-256: c52fe21963267ed1517e1500df09937edc95db28f214d5100db285c80d83f9d6
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that mimics a search result for exam answers, likely intended to trick the user into visiting a malicious site. ClamAV and ML classifiers strongly indicate maliciousness, and the PDF_URI heuristic confirms the presence of an external link. The document body, though heavily obfuscated, contains text related to 'ap chemistry exam 2016 multiple choice answers' and the authoring application 'wkhtmltopdf', suggesting a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://xezojetit.ru/wix?keyword=ap+chemistry+exam+2016+multiple+choice+answers PDF link annotation
    • https://cdn.sqhk.co/wusakituzu/hbiibgc/fishdom_cheats_diamonds.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/fgfaIQ7/sinufivavufewovovebo.pdfIn PDF document text
    • http://rebezun.mygamesonline.org/kadolinonukoturotogeges.pdfIn PDF document text
    • https://cdn.sqhk.co/tuponapalab/gjghicR/chocolate_protein_shake_recipes_healthy.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/jXx7f0e/ancel_ad310_update.pdfIn PDF document text
    • https://cdn.sqhk.co/mibuxedufexi/a1Mgfge/edit_rotate_pages_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedisijusa.onlinewebshop.net/tebebuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/what_does_the_number_607_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/jifejapibuxizorureji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef8ea41e-ab58-4829-b35c-ecc6d1c27bb2/wipugekunujamipobinurojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a1c7ab8-3b38-4480-806d-83f235dc4a94/what_are_the_pharmacy_hours_at_walmart_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7664e657-977f-4bbd-9e1a-7528802c31b0/how_do_i_reset_my_whirlpool_duet_steam_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9caa4eb-d1e3-4485-9d29-6bee66143411/minapiduwemabo.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/xezaj.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/50813450706.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/kalosonediritim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6543d449-a021-47fd-9a25-502c37e6a45d/lenovo_g50-80_memory_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5865f1f8-2764-4bf8-8826-659cd7ad6f42/john_deere_gator_hpx_4x4_starter_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bca1ddb6-e09b-4c29-ae38-6afbc076f697/geometrical_formula.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_off0000f73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 5904 bytes
SHA-256: a90225add3e2c0de67283f1c0ec87318b848079d63eeb9bbf30a6bdbbc1e7751
font_01_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 11228 bytes
SHA-256: 5681d8a9c2176cbc81c991c0e67ef3d31b73a3163416569d32651c2fbb9402c6

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