Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9e770f886312d4…

MALICIOUS

PDF

73.6 KB Created: 2021-04-06 17:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0e10d5df610d004469a89f733e5be77 SHA-1: bb9d3840f823c87cb683e7226d422c98bce35d92 SHA-256: ff9e770f886312d4eef8e343dfd1a70ce315f5bf8c735daae709cfc43a404a90
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely leveraging social engineering to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://soxebez.ru/wix?keyword=the+nitrogen+cycle+worksheet+pearson+education
    • http://birjand.design/rocket_league_free_keys_ps4c4omu.pdf
    • https://cdn.sqhk.co/fadejiweruw/3gghdje/nasa_logo_red_vector.pdf
    • https://cdn.sqhk.co/gasariba/7Whdiau/2pac_lyrics_dear_mama_download.pdf
    • https://cdn.sqhk.co/luwesefizi/hgjfuji/define_talisman_in_a_sentence.pdf
    • http://sberetransfer.online/reported_speech_questionsr5k6z.pdf
    • http://migerov.xyz/89096644533snn3b.pdf
    • http://anarchymedya.com/b._ed_course_ka_full_formhxc5u.pdf
    • https://kumazapo.weebly.com/uploads/1/3/2/7/132710765/3552a4fa4.pdf
    • https://cdn.sqhk.co/nefikelifu/q15egje/casino_slots_free_machines_gratis.pdf
    • http://drive4mclaneaustell.com/141067781681xsah.pdf
    • https://cdn.sqhk.co/tajudozizif/QtiigeP/40502543581.pdf
    • https://kovapuneluwaze.weebly.com/uploads/1/3/2/3/132302913/a20e2423d98ba6f.pdf
    • http://jobavapoxoto.22web.org/aeneid_book_12.pdf
    • http://itawegan.fun/dvam1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/de86cdf3-43ce-4de5-90a0-1ac83fefbdda/nifag.pdf
    • http://rimalapotozuf.epizy.com/xawenutagov.pdf
    • http://zutagisite.epizy.com/handel_arrival_of_the_queen_of_sheba.pdf
    • https://uploads.strikinglycdn.com/files/0a1891ad-6b36-4bc2-9df2-39df9d416ef9/wine_enthusiast_12_bottle_wine_cooler_manual.pdf
    • http://katasekut.epizy.com/32643228293.pdf
    • https://uploads.strikinglycdn.com/files/cca6902b-da0f-4b8d-bfaa-c7d47d8b378c/problemas_juridicos_en_mexico_2019.pdf
    • http://puwokamavureme.rf.gd/bacterias_anaerobicas.pdf
    • https://uploads.strikinglycdn.com/files/03c4b792-6028-4a60-a543-722c30619b7c/how_to_repair_keurig_k10.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9f2.bin
585f4289e50c2b373ae004d007f8bfc3f77f41b76b524e7860a9299e99a91f7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F2 5544 bytes
font_01_sfnt_off0000dce4.bin
9921765a2f3c58dc3c019d036ab7c134c582a9d8f6e1595a4187b1b3571a5b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 9772 bytes
font_02_sfnt_off0000fe9b.bin
c70296238cc169babd2661da79b7440d7dc9a5a26a4fc51e66338573c6e3e7d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9B 17544 bytes

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