Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c158755236bf18…

MALICIOUS

PDF

80.2 KB Created: 2021-04-09 04:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 670be3bedfca6f0db9d67cc0f9e261e1 SHA-1: ddcc2377939245263bbabe4360fb71494211e085 SHA-256: a8c158755236bf1892549758e76a492f9d51b68df54eef48525856b7ce168809
222 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru', which is likely used to host or redirect to a malicious payload. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to movie downloads, suggesting a lure to trick users into clicking the malicious link. ClamAV also detected this as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=on+the+road+movie+download+in+hindi In PDF document text
    • http://fikepoj.22web.org/tefadususidulifukofazot.pdfIn PDF document text
    • http://sokuzise.iblogger.org/how_to_find_cheating_apps_on_android.pdfIn PDF document text
    • http://xarapover.mygamesonline.org/sample_annotated_bibliography_mla_8.pdfIn PDF document text
    • http://pinezotamex.getenjoyment.net/32155283062.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/3f3ef340-2635-421a-9d1a-c82c4df1e9d4/44477387477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4d6bd6-f7ce-4290-ad62-69a8b0fb9c31/wukimazabolasudotarogiz.pdfIn PDF document text
    • http://mibexumobanoko.rf.gd/30559730356.pdfIn PDF document text
    • http://zefixufedinokas.epizy.com/easy_beginner_crochet_baby_blanket_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/luwulijujikomezewelomoset.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/lafapevinokoz.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/69180711072.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/shigleys_mechanical_engineering_design_9th_edition_solutions_manual_chapter_3.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/63230903480.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_65339ca9f8cd43e6919c8365f7b4904c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/83025130529.pdfIn PDF document text
    • http://rixuroruwe.myartsonline.com/access_database_2020_tutorial.pdfIn PDF document text
    • https://24b051fc-04af-4e2d-8b9e-4e75c06063ec.filesusr.com/ugd/1a488c_4b6d8429a73c410484a6799f0afb963e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/9183107368.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/asge_guidelines_antibiotics.pdfIn PDF document text
    • http://numorajigot.epizy.com/chapter_5_membrane_structure_and_function.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6125b418-3b1b-452f-bcfd-7249d6ecaa86/tamezixe.pdfIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_1fa1b9e0fe8f4c699c9151e5615908bc.pdf?index=trueIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_04fd6046fa5b4ba8983fdbd7df8afb69.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/alita_battle_angel_2_full_movie_download_in_tamilrockers.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_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 4856 bytes
SHA-256: 3549505fb61bcb184e43520dba36b6ef8a9f056c3581ec3d249f3f926b525d81
font_01_sfnt_off00010037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10037 10732 bytes
SHA-256: 6afe5ab0ab1d387fd4e87b6b1f8c29f182aaf0943089ab179cb3d05f63c0548f
font_02_sfnt_off0001250f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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