Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3333bceff20bcde…

MALICIOUS

PDF

78.9 KB Created: 2021-03-17 23:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfedd9b042fabfa855c36b48ffb5bb27 SHA-1: 6936f37f2a8041316a7f87577f470b9f47077583 SHA-256: f3333bceff20bcde67d0aeaee1cf73ad5be383a1df22330f5a5654fdbb126757
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 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 chemistry, which is a common tactic for phishing documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/aws?utm_term=quimica+organica+e+inorganica+semejanzas+y+diferencias
    • https://cdn.sqhk.co/vitelodikef/jE7jcmI/zotezoral.pdf
    • https://cdn.sqhk.co/janawezexoj/xDkjg8D/crossword_puzzle_maker_free.pdf
    • https://cdn-cms.f-static.net/uploads/4404121/normal_601fa884b31fa.pdf
    • https://cdn.sqhk.co/letopoto/CEhd9jc/bonokalidepibako.pdf
    • http://fejekadiwoxobiz.getenjoyment.net/wexakudutabu.pdf
    • https://cdn.sqhk.co/viwiratoposu/hiPgghi/order_chaos_duels_ios_11.pdf
    • http://tapagigozi.medianewsonline.com/24611207340.pdf
    • https://static.s123-cdn-static.com/uploads/4493905/normal_5ff40a85b7bfd.pdf
    • https://cdn.sqhk.co/fafaviwi/kwjgia3/bendy_coloring_pic.pdf
    • http://memowelubi.mygamesonline.org/factoring_polynomials_worksheet_a_1.pdf
    • https://cdn.sqhk.co/kadeposamo/hf43fwn/16219046100.pdf
    • http://vuvulusigi.scienceontheweb.net/dugalatimenezur.pdf
    • https://static.s123-cdn-static.com/uploads/4390068/normal_5fc69426558ef.pdf
    • https://cdn-cms.f-static.net/uploads/4462974/normal_600e3e81d0ae7.pdf
    • http://tumuduwaju.mypressonline.com/27622878272.pdf
    • http://jokojujut.medianewsonline.com/96548857082.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://furipurisebete.onlinewebshop.net/afghanistan_map_provinces_and_districts.pdf
    • https://s3.amazonaws.com/sinamozagemoger/aflatoxin_in_rice.pdf
    • http://gutekuretejapoj.onlinewebshop.net/catalogo_vimar_plana.pdf
    • http://wozimape.onlinewebshop.net/john_deere_9500_combine_settings.pdf
    • http://zukomakiduw.myartsonline.com/44914942298.pdf
    • https://s3.amazonaws.com/zatazewoz/27262410005.pdf
    • https://s3.amazonaws.com/dozuga/canal_boat_magazine.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35e.bin
00bf7e7a1d6735b0f76d48b01ec3428507e3adbb911be7cdc1fe5d7cca4161af
pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 5596 bytes
font_01_sfnt_off00010667.bin
a74f58ee22d0047fe221bf90d3f51bade6e70c271cbc8cdb2f9441cded8f2953
pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 11512 bytes