Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c51ef6e29491dad…

MALICIOUS

PDF

90.4 KB Created: 2021-04-02 01:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bdc624a38b99da713dac68651f40ba68 SHA-1: 5a54f118e57c2dfa1cdf5141639cfc7ff6a31787 SHA-256: 4c51ef6e29491dadc5c7de21898e480cd7fbcac4865c1b3dd9a6e946777c883c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://resalured.ru/wix?keyword=ap+statistics+unit+8+test+answers PDF link annotation
    • https://cdn.sqhk.co/duxisabaza/jhejikV/best_ear_trimmer_consumer_reports.pdfIn PDF document text
    • https://cdn.sqhk.co/riwajamugem/ge7icUv/2018_waec_chemistry_past_questions_and_answers.pdfIn PDF document text
    • https://rojanekawuveruj.weebly.com/uploads/1/3/1/3/131380666/seguba.pdfIn PDF document text
    • http://creditreportusa.info/crossway_esv_large_print_personal_size_bible_genuine_leather_blackhk4kg.pdfIn PDF document text
    • https://zipawesijapa.weebly.com/uploads/1/3/4/4/134494223/welizimexele_lezawexemi_pujiva.pdfIn PDF document text
    • http://kismykeitio.best/defukulesibubuzitjjhoo.pdfIn PDF document text
    • https://cdn.sqhk.co/repipedifavi/4jc7u66/21798154060.pdfIn PDF document text
    • https://redulexaxoxega.weebly.com/uploads/1/3/0/8/130874010/6709122.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.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://uploads.strikinglycdn.com/files/7f659248-9e02-460e-9ff3-fc164a966cc7/how_to_become_a_good_motivational_speaker.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/rowabezisade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d43196c0-23fe-44ba-afed-d4061262e803/how_to_adjust_kenneth_cole_reaction_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/pride_and_prejudice_chapter_7-9_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/61535614592.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/5003356293.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/super_mario_bros_2_3ds_star_world_coins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d09c397-4145-4ea7-a148-a7a7734b8476/cloud_9_smoke__vape_shop_memphis_tn.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/onclicklistener_button_click_android.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/complex_analysis_3rd_edition_solutions.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 13280 bytes
SHA-256: c973e0152544b75aecef9ec770e7a99b7cc002f1f28f949aff854a0e4887e34b
font_01_sfnt_off00010b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 4940 bytes
SHA-256: f43887378520202d98e2ab0f1f42cb04d9c241415342f35853593a26b8c8d5ad
font_02_sfnt_off00011c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1F 21916 bytes
SHA-256: ce91855cd45954a3e1a832f69ff1c297f0d0ee18e3cbbbfb066520ecddc56df8
font_03_sfnt_off00014dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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