Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a608c88d450957…

MALICIOUS

PDF

97.7 KB Created: 2021-03-26 07:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4573dd011247c0365d1a2624fd3b0c0d SHA-1: e4810436a8c0be83ab93afd0098bb989fd3064f9 SHA-256: 94a608c88d4509574d17f120f658ebc66bda193f77aa6ef5df8c8a84eb8ba6a0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for SEO poisoning or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=force+mass+and+acceleration+worksheet
    • https://cdn.sqhk.co/nixivezez/hSYqyji/58468332826.pdf
    • https://jikesisepam.weebly.com/uploads/1/3/1/4/131406861/7586233.pdf
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/d66a2386858.pdf
    • https://cdn.sqhk.co/kigaratak/ejgiagj/kajujakiboz.pdf
    • http://dalifajebuxog.scienceontheweb.net/deep_learning_for_computer_vision_with_python_adrian_rosebrock.pdf
    • https://cdn.sqhk.co/zezaxemepe/Lgijc8y/dadujusatulepekive.pdf
    • https://senabexe.weebly.com/uploads/1/3/4/2/134265557/vuluxufaduvug.pdf
    • http://mirumumavetifun.mypressonline.com/pathophysiology_of_dysfunctional_uterine_bleeding.pdf
    • http://guzexesuge.mypressonline.com/asus_q551ln-bbi706_notebook.pdf
    • http://winatesef.sportsontheweb.net/24228501772.pdf
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/7820a0ee7bc5.pdf
    • https://cdn.sqhk.co/waxoxewanuvi/fnMLDgj/61638944476.pdf
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/4170471.pdf
    • https://cdn.sqhk.co/jowoluguwoge/ciaY52g/infection_the_invasion_begins_full_movie_download.pdf
    • https://cdn.sqhk.co/kupejabel/2P5gigg/apple_stock_zacks_rank.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gakajitaju.atwebpages.com/micro_shure_pgx4_sm58.pdf
    • https://uploads.strikinglycdn.com/files/cce4a769-6a3c-4ec8-af26-c3f1418fd745/pitewatatutinulotisizo.pdf
    • https://uploads.strikinglycdn.com/files/190274a4-2740-4ce0-9ea8-48c9724fd9d4/29154456747.pdf
    • https://uploads.strikinglycdn.com/files/068805d4-50af-4376-90c8-c62ea526d5f4/86890545948.pdf
    • https://uploads.strikinglycdn.com/files/32a75feb-4e61-4bef-bb92-846c861e473b/que_es_un_estudio_de_prefactibilidad_de_un_proyecto.pdf
    • https://uploads.strikinglycdn.com/files/4191e625-58c5-40c9-a52a-1f3d240dfdb3/tropical_rainforest_biome_in_india.pdf
    • http://jokosen.atwebpages.com/3618796092.pdf
    • 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_off00013437.bin
9a2426587732b512531424fd3fea5f39e4e451475c9740ec338275b461b97971		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13437 5080 bytes
font_01_sfnt_off00014551.bin
a2c2b918b77aecd33d0260684a02a7283f08b1cabb50e3b210ca752831984888		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14551 10972 bytes
font_02_sfnt_off00016ae8.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16AE8 4324 bytes

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