Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c0cb8366e75690…

MALICIOUS

PDF

93.3 KB Created: 2021-03-28 14:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9db806906432ac319846161bf2dd2adb SHA-1: d533c84e1dce6ecc6198f871d8780047e3499e51 SHA-256: 92c0cb8366e75690c4e13e6d7c1e22a28ec82d86fc772464606fae543ec362cf
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs that redirect to potentially harmful websites. The presence of multiple disposable hosting links and UTM parameters suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself is designed to facilitate the redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/strik?utm_term=rex-c100fk02-v%252Aan+da+%25D0%25B8%25D0%25BD%25D1%2581%25D1%2582%25D1%2580%25D1%2583%25D0%25BA%25D1%2586%25D0%25B8%25D1%258F PDF link annotation
    • https://cdn.sqhk.co/xugikokazo/M0jiQgd/demataxamafavanazumikuzu.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/gelib.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/N0XPmjh/footsies_rollback_edition_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/jeiibhd/pexutumavowoninox.pdfIn PDF document text
    • https://cdn.sqhk.co/lagazowasobo/jfgcghj/snapchat_stock_ticker_symbol.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/4uAhajb/43842402051.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/ajiXieX/pilot_log_book.pdfIn PDF document text
    • http://lavorunolutoga.22web.org/snake_pass_pc_game_free.pdfIn PDF document text
    • https://roriwemako.weebly.com/uploads/1/3/4/5/134599113/bulaxowejafedopemabo.pdfIn PDF document text
    • https://cdn.sqhk.co/wudubure/1EjfupI/applied_calculus_10th_edition_answers.pdfIn PDF document text
    • https://xozavefo.weebly.com/uploads/1/3/4/0/134018900/jewajuzami-tosimapozux-fugilirijudevid-zavesa.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/hggihbc/cultist_simulator_ghoul_review.pdfIn PDF document text
    • https://bixowupe.weebly.com/uploads/1/3/1/4/131409305/zamoru.pdfIn PDF document text
    • https://zanewodibamejat.weebly.com/uploads/1/3/0/9/130969445/7932630.pdfIn PDF document text
    • https://cdn.sqhk.co/diruzatojep/RVOicjc/werumam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/times_table_worksheets_1-12.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/zupegejixigerovudepa.pdfIn PDF document text
    • http://letozin.rf.gd/36392294836.pdfIn PDF document text
    • http://jematino.rf.gd/universal_jumbo_remote_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/xazegakusoruviwepamu.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/can_you_play_classical_guitar_like_an_acoustic.pdfIn PDF document text
    • http://figelaziri.epizy.com/how_to_replace_ink_pad_epson_l310.pdfIn PDF document text
    • http://lofilujajobefi.rf.gd/elicitation_and_collaboration.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10740 6100 bytes
SHA-256: 8065be7c9cd4c75b3e02677d637fe438d785e59d13d97ee23376303d4dcf0068
font_01_sfnt_off00011c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C20 21956 bytes
SHA-256: b8cb487eb6fb3e447fd6687f2158de0630f0e33fa4baf6bc598a59d19bb2f9ab
font_02_sfnt_off00014f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F82 16416 bytes
SHA-256: b13feff8c5b564f7677060085945be61112f8f7aeeaada995cbedf689070d2bf