Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6ff47d8d8e7cdc…

MALICIOUS

PDF

74.1 KB Created: 2021-02-17 16:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 3f4d96c09a04060b75bbd9b028db05cc SHA-1: aa2a2ea5162f02508bff2c60c7fdeb5203d91bbf SHA-256: dc6ff47d8d8e7cdc02acf99a144a5a84c4efbc756663e38bb914b0777db7e0df
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=skyrim+special+edition+wet+and+cold+holidays PDF link annotation
    • http://thailandlove.site/38742482080rpyqe.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/1abb44e899.pdfIn PDF document text
    • http://maska-respirator.com/37543244712skpax.pdfIn PDF document text
    • https://vakumijajuxos.weebly.com/uploads/1/3/4/4/134465568/207879.pdfIn PDF document text
    • http://retoxebed.22web.org/beatbox_music_player_mod.pdfIn PDF document text
    • http://rawapob.22web.org/how_to_configure_cisco_linksys_e2500_as_access_point.pdfIn PDF document text
    • https://cdn.sqhk.co/salifera/hdxhaKi/dungeon_archer_run.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwebilux/jjKyIhi/26767289167.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/QhhbghD/rapak.pdfIn PDF document text
    • http://realnoe-obshenie.online/advanced_reading_comprehension_test_with_answerszuyrs.pdfIn PDF document text
    • https://dapifakefigev.weebly.com/uploads/1/3/1/6/131636612/gesuta-potivukedibego-renoxujofula-gelukakatav.pdfIn PDF document text
    • http://b0xberry.online/vetitomejogarupit1xyy.pdfIn PDF document text
    • https://cdn.sqhk.co/gotofebelu/WajKAhc/splatoon_2_booyah_bomb_weapons.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478438/normal_5ff5dec95ea25.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/ihgi69O/slither._io_cheat_codes_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pubitawiwinas.rf.gd/billie_holiday_summertime_sheet_music.pdfIn PDF document text
    • http://vagekuzoxovav.epizy.com/30051932624.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_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 5676 bytes
SHA-256: fb95a9341109c456f7b5761c92bab6130e444ad15a4a217d2b47dbe7215b1208
font_01_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 10212 bytes
SHA-256: 7df8894e88d5a4d500a6e52dad3cb11f18d1d41928ffbf544afe0f310b228cb2

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