Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d12cef9c78d2955…

MALICIOUS

PDF

81.2 KB Created: 2021-05-12 20:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6859fbc5c74ecd5de64bcbf01cf4c0db SHA-1: 3e8bd6effff11bf9dff00c4185cb8f5c3ef6fac0 SHA-256: 5d12cef9c78d29553f1e9260954be17c40f1064b1a9b0a43456208b2a6ee2253
186 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded external links, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO spam campaign, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://fokemale.ru/strik?utm_term=why+does+my+ac+light+blink+3+times PDF link annotation
    • https://cdn.sqhk.co/jipogidara/xETbjb4/love_songs_80_s_90_s_karaoke.pdfIn PDF document text
    • https://cdn.sqhk.co/xewumoxu/f2ichc1/formula_1_qualifying_2020_results.pdfIn PDF document text
    • http://leseweremizew.scienceontheweb.net/a_court_of_mist_and_fury_free_audiobook.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/ghOhhhM/rolling_stones_multiple_tongue_shirt.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/q3jREjd/change_eye_color_permanently_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/dakuwuwuzije/fjgFiif/freezero_game_mod_apk.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/what_are_examples_of_capital_budgeting.pdfIn PDF document text
    • http://xovijezup.mywebcommunity.org/mufizigob.pdfIn PDF document text
    • https://cdn.sqhk.co/surixirulol/01bHFge/kifasuwukonetakuvebosaje.pdfIn PDF document text
    • https://vodunifowabot.weebly.com/uploads/1/3/5/9/135992931/4220452.pdfIn PDF document text
    • https://vipamabukaxeban.weebly.com/uploads/1/3/0/8/130874648/ziragopemugi.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/hfjbjjd/double_clutch_riddim_instrumental.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://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_c897bbac18324767add46cb6d949714c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/xobaw.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_be565a8169f6441f9a02f94d37f039c5.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_cb209e8f04784dfb8e1b762ebd1780cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/heart_anatomy_review_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/windows_8_64_bit_torent_iso.pdfIn PDF document text
    • https://2b075577-062e-477b-ba44-a680027dca12.filesusr.com/ugd/ee943f_011abea7048746788ca2c7665646f2b0.pdf?index=trueIn 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_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 5528 bytes
SHA-256: ccd7fc3822bf66bcfdda9f8aba1868678341c1d06ac867ad0b1163e618b3fbfb
font_01_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 10748 bytes
SHA-256: 581ffc37f09a500f26a37238efef56a9764555134886b544792312f962178765
font_02_sfnt_off00012905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12905 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34