Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5044ec09eab3cf8…

MALICIOUS

PDF

95.0 KB Created: 2021-03-18 03:34:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8310c632cacf94d6221e65d72f9eba25 SHA-1: d181daf8eac38868753d660dfbdaec1f6b879d6f SHA-256: b5044ec09eab3cf8156edcb03d04e5269640c2289c9b03ab645fb79185f33825
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a primary one pointing to 'xezojet.ru', suggesting it's used to redirect users to a potentially malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm hosted on disposable domains. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/award?keyword=two+digit+subtraction+with+regrouping+worksheets+pdf
    • https://cdn.sqhk.co/xevowuto/aPIjhdc/97872277451.pdf
    • http://zolepop.mypressonline.com/princess_diaries_3_movie.pdf
    • https://cdn.sqhk.co/nexetifosam/hgjjujj/emergency_sounds_ringtones.pdf
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/9e616.pdf
    • https://nefatalij.weebly.com/uploads/1/3/2/7/132740339/2986657.pdf
    • https://cdn-cms.f-static.net/uploads/4370071/normal_600ee76d28daf.pdf
    • http://koxivesuvif.mypressonline.com/melex.pdf
    • https://static.s123-cdn-static.com/uploads/4408584/normal_5ff514e10e711.pdf
    • https://cdn.sqhk.co/vakolitakap/hijidfF/download_curvy_punch_3d_mod_apk.pdf
    • https://cdn.sqhk.co/sikudile/idjRBij/pocket_city_tips.pdf
    • https://cdn-cms.f-static.net/uploads/4459631/normal_60443cc895cd1.pdf
    • http://beduzevitugok.mypressonline.com/bunanimoxupawiga.pdf
    • https://cdn-cms.f-static.net/uploads/4422894/normal_601f18ba02042.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_1ed0e060fdf745f7a423f6bb34a0d2ed.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3e8de0e8-609b-4585-9714-63e45ca18429/origins_of_totalitarianism_sparknotes.pdf
    • http://jalebuvubo.myartsonline.com/vedezubatokex.pdf
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_94905270a75d404cb20f095c2fbc448a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9c8c52a0-c2cd-4797-a638-b13e22b5cce0/wulomuxubom.pdf
    • https://uploads.strikinglycdn.com/files/7de2c12b-ecaa-40a6-b1e8-21253b0f3ec2/17230151432.pdf
    • http://dogiwexor.myartsonline.com/windows_10_voice_commands_list.pdf
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_c178921f72c44f2ea11c6dff2d035e5f.pdf?index=true
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_046e1106685e48feb389b354fbfda938.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128fb.bin
7a5b04a2246dfcbd9a87a09483e522a930867b91493361fda894fe5679a07a35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128FB 5512 bytes
font_01_sfnt_off00013bc2.bin
8a060bb23b963829b2abc5a4d9d2811322f2b6de468915a13e671024e878384a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC2 10680 bytes
font_02_sfnt_off00016025.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16025 4324 bytes

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