Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a884bc38d1035c…

MALICIOUS

PDF

80.9 KB Created: 2021-03-08 20:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9b5041ca0db64a3f388b440804935a54 SHA-1: dd83d23b3f98e089da20a294b2262f5a1c24dea4 SHA-256: 41a884bc38d1035cc3140ef43b092a71e843aaf4f9fbfb16cda81b7c5e971b2a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one specifically pointing to a domain designed to mimic search results for a product, suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a network of links on disposable hosting, likely for distributing malware or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://midufefew.ru/wb?keyword=canon%20580ex%20ii%20price%20in%20india PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490376/normal_602ac457cb428.pdfIn PDF document text
    • http://romeita.fun/wamopojixanetunaxegw8o7p.pdfIn PDF document text
    • http://healthit.space/11225359070pg8yj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_5ff5f6ffc9632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404757/normal_604222ee81f44.pdfIn PDF document text
    • http://saudiautoinsurance.com/find_my_server_ip_linuxqlis3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465025/normal_6020722082e11.pdfIn PDF document text
    • http://mrt36.ru/17594363664xefic.pdfIn PDF document text
    • http://acupofjacob.com/dragon_quest_builders_2_room_guidei8ssi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404955/normal_5ff76c5954189.pdfIn PDF document text
    • http://legalvictory.group/wirezodutasobowodvbwo2.pdfIn PDF document text
    • http://zubiki.top/do_blood_pythons_make_good_petsd5sxf.pdfIn PDF document text
    • http://paselon.getenjoyment.net/a_little_history_of_the_world_book_review.pdfIn PDF document text
    • http://lamovingcompany.com/limemewuderenuwuyjfol.pdfIn PDF document text
    • http://retamos.mygamesonline.org/88703076329.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/g_shock_mudman_watch_band.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/lefemijip/79956915598.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/72221954508.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/72682474002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5e3fe7-c5c9-4851-9d1c-96833793902a/22063080027.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/76420315831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/753aa45f-7a22-455a-9858-52e34e8a641a/vocabulary_builder_activity_networks_answer_key_ancient_egypt_and_kush.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_off0000e664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 5292 bytes
SHA-256: 998947369f32c7f01d1f05dd716529ab9a4f549a12748738f5b2c1b19d33ba16
font_01_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 11376 bytes
SHA-256: 3868fd4d7c5a05bd0fdf3b3d842763d904a1b6343fe4667b2e37d0c7883753c8
font_02_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 16164 bytes
SHA-256: 4bd16c8abd39118228c1571b0005d4eb3b3e943e572fd92a2a80cfcb7b749349

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