Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf50b3e27f383132…

MALICIOUS

PDF

80.3 KB Created: 2021-03-06 15:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7b9f9d413828e0258dd25a21949e5a40 SHA-1: 254ec2f092f58b91aa1ecc1863c7c44d738013e6 SHA-256: bf50b3e27f3831321ee58e06b6df21213b013013a7bc91ca2193415db4d2c2ca
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'dugedepap.ru', which is likely a lure to trick the user into downloading a secondary payload. The document body, though heavily obfuscated, appears to be related to technical information, further supporting a phishing or social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/wb?keyword=how%20to%20reset%20bios%20password%20dell%20latitude%20e6410 PDF link annotation
    • http://peskomment.ru/rupodisabapaxorrv5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462985/normal_5fcc708ceb862.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417214/normal_5fd081d76024a.pdfIn PDF document text
    • http://stavki-na-sport.site/3411536894vzpwy.pdfIn PDF document text
    • http://latuha.com/lemotit1git.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/mililitros_a_gramos_mantequilla.pdfIn PDF document text
    • http://eagleaff.com/45668551199ut1rw.pdfIn PDF document text
    • http://tapidiv.medianewsonline.com/90559024524.pdfIn PDF document text
    • http://klosheff.xyz/download_footrock_2_mod_apk_android_1l00ev.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/c79d93e4-9ebb-4fe9-ac3d-2c7f3db26d9e/48234592383.pdfIn PDF document text
    • http://mawokale.myartsonline.com/will_school_fees_be_reduced.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eaa34d3-a237-4067-aead-dec82d7e658b/tetavokinenukebevixeduka.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/56256860342.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/catholicism_in_the_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/heartbeat_2016_episode_guide.pdfIn PDF document text
    • http://livirava.atwebpages.com/78974939572.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/7864981890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dea0e54-17c9-4170-a33c-7baa57f8c800/asus_memo_pad_7_lte.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/aabb_technical_manual_16th_edition_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/difference_between_centralised_and_decentralised_information_system.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/civetta_critical_care.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42b9cc72-96cf-4ac2-a398-8be8a326d978/79887509607.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_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 5360 bytes
SHA-256: 78d77f377268d163a8764a91b288a1ee748e76c7d70c1633b0616418503392d0
font_01_sfnt_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 10552 bytes
SHA-256: 8b77d28791ef7471ad92fd1b424eee4f73860855375cb280d8e14cdf00e5e466
font_02_sfnt_off0001259e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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