Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3666bcb47e25fb5…

MALICIOUS

PDF

80.8 KB Created: 2021-04-08 21:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f0f00598dfa4bc1382d9601b78d82d68 SHA-1: b64c8172db006d09dfa0dc34412c14cc2bba5427 SHA-256: f3666bcb47e25fb57585ce5571daf6ee38071d0ce6d40ff84e2c254f10dfbdda
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be a redirector. The document body, though heavily obfuscated, contains text related to a movie title, suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/strik?utm_term=harry+potter+y+la+c%25C3%25A1mara+secreta+resumen+pelicula PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496816/normal_5fd03be64f607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481162/normal_604b3f1704f93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496225/normal_60536f1c3427e.pdfIn PDF document text
    • http://zonixutazexe.iblogger.org/2745189254.pdfIn PDF document text
    • http://akmurzina.com/bekakojob6elar.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/58418352981cum0s.pdfIn PDF document text
    • http://chelamela.org/7809758910631x09.pdfIn PDF document text
    • http://katorewudejizut.22web.org/download_audio_drivers_for_windows_7_ultimate.pdfIn PDF document text
    • http://tihefers.online/parts_of_speech_anchor_charti4bca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/904e4971-ca8c-4296-88ec-7edf02364e26/tosegavemizibebaxafux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c317c6b6-0352-4eae-a904-2e3531bc8a54/dell_optiplex_7010_graphics_card_driver.pdfIn PDF document text
    • http://pefamubipilefe.epizy.com/26616911919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/130dcdbc-3448-4f43-a0dd-80c2fda322b8/ms_project_2013_download_64_bit_iso.pdfIn PDF document text
    • http://rizaxofu.rf.gd/agile_definition_of_done_template.pdfIn PDF document text
    • http://zekaroja.epizy.com/how_much_is_acer_laptop_battery_in_nigeria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c56ccf2-6341-453c-8830-ef582a63519b/how_much_does_architectural_engineer_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c7e75b5-ddd2-42d5-a472-30d2011e27ce/nowuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0403731c-df87-45c6-98c3-5f2dabda8692/foxconn_n15235_motherboard_vga_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d18a3d-c58c-4594-ae82-b85df4250a42/frases_del_principito_y_su_rosa.pdfIn PDF document text
    • http://koburolamugalo.rf.gd/kusejosa.pdfIn PDF document text
    • http://zexenafejesited.rf.gd/kezuworutonuzamuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/395f21c1-06fe-4ade-ba53-c80d3f9a7d69/joxitotezuvomazenozow.pdfIn PDF document text
    • http://filujade.epizy.com/46897906059.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_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 5376 bytes
SHA-256: 331e860dbe335e4dc10da9b6f28b7bda75f11cf790447569dc4e5698b0c4932f
font_01_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 12084 bytes
SHA-256: bc18f52adacd70dc7d6771996008d8ddd09f393ae67fd0e32f0ea0cd6874068b

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