Malicious PDF — malware analysis report

Static analysis result for SHA-256 02fb5ced24861bb3…

MALICIOUS

PDF

75.5 KB Created: 2021-04-04 20:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6567b70880ae4f83887c9085a3200094 SHA-1: e07112ac9e85ebc7f6246bae359a8edaf9ae2960 SHA-256: 02fb5ced24861bb3f63d49b7234cd9638135a1d162a0747febee1242bbd88d0d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=beats+solo+3+special+edition+silver
    • https://cdn.sqhk.co/genopeno/gdMwnhj/7559174273.pdf
    • https://cdn-cms.f-static.net/uploads/4376404/normal_604cb2cc3b2b5.pdf
    • https://cdn.sqhk.co/ruxukulalodi/ehgLghq/flick_goal_level_78.pdf
    • https://xulajaxosu.weebly.com/uploads/1/3/4/3/134366267/rotakorovix.pdf
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5fd1cdb0ae0e8.pdf
    • http://zonitupupafof.sportsontheweb.net/ciencias_naturales_10.pdf
    • https://cdn.sqhk.co/moxulofilose/icgdAhb/luzikejuzun.pdf
    • http://bixaxivajujojar.mypressonline.com/16137640687.pdf
    • https://kawififelotus.weebly.com/uploads/1/3/1/4/131437833/sepawovipefubof.pdf
    • http://buvanerupapuko.22web.org/54169759234.pdf
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/129061.pdf
    • https://cdn.sqhk.co/vajirasavuz/hhaRtji/edmodo_parent_code.pdf
    • https://cdn.sqhk.co/lexijunibul/hKjcKhe/13892952473.pdf
    • https://cdn.sqhk.co/bemovunilupo/qjdijJw/paper_io_3d_new_levels.pdf
    • https://cdn.sqhk.co/xapewiwud/EP6hbif/21420200971.pdf
    • https://sujujiga.weebly.com/uploads/1/3/1/3/131379538/zadojugerafanoju.pdf
    • https://cdn.sqhk.co/tuvameboroke/nicibia/26138700048.pdf
    • https://static.s123-cdn-static.com/uploads/4455672/normal_600017166f4c3.pdf
    • http://nomokesus.sportsontheweb.net/93190190206.pdf
    • https://fogunovavak.weebly.com/uploads/1/3/2/6/132681822/zonoriji_mipajiximonina.pdf
    • https://cdn.sqhk.co/lutakakijuro/XbiaEic/pixel_art_theme_noel_cycle_3.pdf
    • https://static.s123-cdn-static.com/uploads/4407084/normal_6008055201c6d.pdf
    • https://cdn.sqhk.co/fekepazerox/JgfnhjP/28504947594.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xumusemowujev.epizy.com/cibola_burn_book_4_of_the_expanse.pdf
    • http://dadagax.epizy.com/idiom_dictionary_free_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac4.bin
34418b9fdf02f1714553e042e4a8cf40420d54a07b570e522203dc1e034d29d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 5340 bytes
font_01_sfnt_off0000ed00.bin
2327df7405d4da86955423e027c551cb2da2adac2129706c7e346a8f58101c8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 16044 bytes

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