Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f6a6d668980b48…

MALICIOUS

PDF

70.9 KB Created: 2021-04-25 10:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c91c30c7479121ab588da885c70f528d SHA-1: 287833a447b340d3007c71484003a8b15e40f900 SHA-256: 18f6a6d668980b4842284a6c343ccaec9629354065aa17c123f9118f2a3cb3ba
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 contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure related to oven temperature sensors, likely to attract clicks to malicious or spam content hosted on the external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=where+is+the+temperature+sensor+located+in+an+oven PDF link annotation
    • http://ita-fitness.fun/vozisikuvojof5nwy5.pdfIn PDF document text
    • https://lufodeku.weebly.com/uploads/1/3/4/5/134586195/1493046.pdfIn PDF document text
    • https://nirilixurem.weebly.com/uploads/1/3/4/4/134474770/jesubonozetadupuzim.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/flexible_budget_reportrfbpb.pdfIn PDF document text
    • http://skout.tech/all_my_friends_say_it_over_mate_lyrics_cimorellij3mwe.pdfIn PDF document text
    • http://espacecmb.xyz/why_is_median_household_income_so_lowhiigj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9594ef0-087a-45b9-a6fe-057c21091d7f/zitalerawomavuxavosod.pdfIn PDF document text
    • http://mogujuku.epizy.com/lopogizig.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/voxatobelenuxenukelo.pdfIn PDF document text
    • http://gidegezujonin.rf.gd/kulivuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f823de5c-b13e-4ea1-8613-9eb960c8e0fc/how_much_can_you_pawn_your_title_for.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/bluetooth_headphones_delay_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73752c41-7128-49cf-92d7-332eefae0c91/77128372099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b025a4d7-8dfb-41d8-b7c9-13ba473e5950/45376572330.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/7947703678.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/how_to_become_a_theoretical_physics.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_off0000d747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD747 5388 bytes
SHA-256: 5421a4188f1d674499680b3e0fb40a23d5a4444663b0bc2694234dae7c6a75e1
font_01_sfnt_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 10740 bytes
SHA-256: b82a037e5aca26f55ae50a5c07ceaf2f6833247d2f21032d9ab49a7c118fbd4d

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