Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fef10b24075fba…

MALICIOUS

PDF

72.9 KB Created: 2021-03-14 09:26:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5aa79707313671339d6c33945abb00d8 SHA-1: d77f3ffbb53ad696ab4dc1183aca643e3c57e0c7 SHA-256: 87fef10b24075fba5d38a7ae05313a4ba80f819d80a6c9bd38590fa1726fd8e5
156 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, indicating a phishing or trojan threat. It contains a large number of external links, many of which are SEO-themed, suggesting an attempt to drive traffic to malicious sites. The embedded URLs likely serve as lures to phishing pages or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/award?keyword=abstract+algebra+david+s.+dummit+richard+m.+foote+pdf
    • https://cdn-cms.f-static.net/uploads/4404113/normal_60337e30654f3.pdf
    • https://cdn.sqhk.co/mujowofapubi/jhs0n7U/vejosamekimo.pdf
    • https://cdn.sqhk.co/gabazumad/wicGjil/juicy_fruit_chewing_gum_flavor.pdf
    • http://babblescoop.store/71903257353u6mxo.pdf
    • https://static.s123-cdn-static.com/uploads/4388052/normal_5fc9edb7140b9.pdf
    • https://cdn.sqhk.co/rozamulev/uJjboBr/zugedixesitum.pdf
    • https://cdn-cms.f-static.net/uploads/4467298/normal_601b2cc6bc524.pdf
    • https://cdn.sqhk.co/podidiwi/5krTPTP/84847766413.pdf
    • http://vazawujuzu.sportsontheweb.net/25019116424.pdf
    • http://vawurabel.mygamesonline.org/whirlpool_duet_dryer_instruction_manual.pdf
    • https://cdn.sqhk.co/jerivudofin/vugiuig/cafe_near_me_open_late.pdf
    • http://myfirstsite.xyz/callaway_mavrik_standard_driver_reviewzsjyr.pdf
    • https://cdn.sqhk.co/mowuseparap/iaghqJd/petiminutemugujorunem.pdf
    • http://nout-sale.site/new_movies_hollywood_and_bollywoodlqzwo.pdf
    • https://cdn-cms.f-static.net/uploads/4484994/normal_602c9fd28a1e9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_2647e8115c914a5bba9db40222e266be.pdf?index=true
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_120a881d33634f1c8ba9a77b201bdb3d.pdf?index=true
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_5ed1651ae52b4d3895ba488e6f11c203.pdf?index=true
    • http://pedirite.onlinewebshop.net/rajopib.pdf
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_4ce4e613599a457d8583dbf31b9e4676.pdf?index=true
    • http://womawujun.atwebpages.com/cuanto_es_el_salario_minimo_semanal_en_mexico_2019.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_off0000d284.bin
09b2c9a2b3ced34f38a639351899f1780d0db24a33b59f9c8cd28ef8a9ab858b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD284 5568 bytes
font_01_sfnt_off0000e570.bin
85dd7286e1a8e55c9cb4e6fa07ead6d18a3c037d6c9ee05cf91046cd950a8728		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 10172 bytes
font_02_sfnt_off000107f6.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 4324 bytes

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