Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df0e3557c3281c7…

MALICIOUS

PDF

89.4 KB Created: 2021-02-15 06:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 35b4492163af74576ce21970a423db5f SHA-1: 83290f156a4b6af3d340c3f1374e7103d4bc04f6 SHA-256: 0df0e3557c3281c79a8d45e47890dab5ddc212768c73ed1240d79292317d7be8
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=conceited+wild+n+out+tattoos In PDF document text
    • https://cdn.sqhk.co/kurotevu/ajaMwij/stick_run_hack_version_unlimited_coins_and_gems.pdfIn PDF document text
    • https://cdn.sqhk.co/xoberuweri/jdjjab2/82063935795.pdfIn PDF document text
    • http://momentshop.space/wojivowehb2xo.pdfIn PDF document text
    • http://fusubakitakudup.66ghz.com/hci_accessibility_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/sanojuxako/phGM6ig/fifa_penalty_shootout_game_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/Upr907G/how_do_we_say_hi_in_chinese.pdfIn PDF document text
    • https://cdn.sqhk.co/vagewovupug/ngdcifm/45301121113.pdfIn PDF document text
    • http://fruktovik.com/99433374246isj3s.pdfIn PDF document text
    • http://reduslim-officialsite.site/encyclopedia_of_philosophy_paul_edwards41sot.pdfIn PDF document text
    • http://pikaromabunoteb.iblogger.org/povatebifavafilidus.pdfIn PDF document text
    • http://kolomata.ru/xasiburapufavexavijsmj3f.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/ig3hagv/dubagofaxemuwuxaxadesexu.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/qgjjjqK/ouroboros_fullmetal_alchemist_significado.pdfIn PDF document text
    • http://jijimaxugixu.22web.org/16509642000.pdfIn PDF document text
    • http://like-store.site/xufapoporineketadoxxorq.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kapigazezej.epizy.com/iswaran_the_storyteller_question_answer_class_9th.pdfIn PDF document text
    • http://wozaxanakix.epizy.com/97983410192.pdfIn PDF document text
    • http://kizuwopo.epizy.com/android_adb_shell_stop_app.pdfIn PDF document text
    • http://xekifefo.rf.gd/disinfecting_sheets_with_vinegar.pdfIn PDF document text
    • http://xuvunemomot.epizy.com/23961529395.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000107d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x107D7 15832 bytes
SHA-256: 2d3882f61f0426bd5cac6a44429230b47383ea6c800cd718aa25e31fbfa3344e
font_00_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 4832 bytes
SHA-256: e154334d17ca04dfb8bd80c1b3648490f6c3d6ba105d72b74a4310b85b658a57
font_02_sfnt_off0001328f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328F 10848 bytes
SHA-256: 8e4f9d4ef3b4a0069c2e8af5bfddd205dce1e5bccd2dc4a923ba0858168a0d6e

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