Malicious PDF — malware analysis report

Static analysis result for SHA-256 f037c9e6c411f4b7…

MALICIOUS

PDF

70.5 KB Created: 2021-03-03 23:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e8e888a87b46179fd8a3bf92a017b4aa SHA-1: b6d3a0605501c9ff3051d28ccfa0315b8ff18e5b SHA-256: f037c9e6c411f4b78dcffdf6ea31132aeb2fdf66b9843d24456bd8f706b4e169
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to its creation, which is likely a lure to disguise its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=concept+definition+internal+text+structure PDF link annotation
    • https://rixexumig.weebly.com/uploads/1/3/2/6/132681576/todokevires.pdfIn PDF document text
    • http://myfavoritesun.xyz/zotesijevojaiyxxa.pdfIn PDF document text
    • http://lomuwugevona.getenjoyment.net/voyages_in_world_history.pdfIn PDF document text
    • https://rogupogadagome.weebly.com/uploads/1/3/1/3/131398605/8684e16.pdfIn PDF document text
    • http://creditscorefix.info/silatavikoxopiboxazulos1lsia.pdfIn PDF document text
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/e8b1b32.pdfIn PDF document text
    • http://vanebitedituki.22web.org/menujopufe.pdfIn PDF document text
    • http://varistop.site/free_nds_emulator_for_android_6_apkwwzx3.pdfIn PDF document text
    • https://xogukozatakik.weebly.com/uploads/1/3/1/4/131453421/bupijojesoj_majevoje_tagun_pilap.pdfIn PDF document text
    • http://startbastar.online/surface_area_calculator_for_hexagonal_prismmv8bk.pdfIn PDF document text
    • http://gumugupibope.iblogger.org/asus_rt-ac68u_parental_controls.pdfIn PDF document text
    • https://petominezejoza.weebly.com/uploads/1/3/2/3/132303337/xejifi_tigademo_buxozavi.pdfIn PDF document text
    • http://onlinetyz.xyz/latitude_e7450_specsw0lfm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taderadoximez.epizy.com/la_casa_de_los_espiritus_sinopsis_del_libro.pdfIn PDF document text
    • http://teguwawax.rf.gd/wikeda.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/how_to_draw_beginners_easy.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/39348471597.pdfIn PDF document text
    • http://fetufebutegiv.rf.gd/ashampoo_burning_studio_2016_free.pdfIn PDF document text
    • http://fafuwite.epizy.com/instagram_blocked_list_android.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_off0000d685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD685 5124 bytes
SHA-256: b4c972ab8a11a94ad5bf27aaeeaceb012e693ac5a23ca66f0c83830f25b163b6
font_01_sfnt_off0000e807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE807 10600 bytes
SHA-256: 472f73e574b53862e5e58f175e790e555259abcc9d797409c84408437771735b

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