Malicious PDF — malware analysis report

Static analysis result for SHA-256 3775142be1ec019f…

MALICIOUS

PDF

85.2 KB Created: 2021-03-16 19:17:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bf8dc31dd4cf8bac3d9c72d2470deca SHA-1: aec6130ee5255cc7c5ba5688937d4b8ca9f9a83c SHA-256: 3775142be1ec019fe0918a3dee48b017352624b269454b74a68bc399675dcdd4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, characteristic of a link farm. One of the embedded URLs, 'https://resalured.ru/strik?utm_term=what+games+will+be+on+ps5+from+ps4', suggests a phishing or scam attempt by luring users to potentially malicious content. The PDF structure and the presence of numerous external links indicate an attempt to manipulate search engine results or distribute further malicious content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=what+games+will+be+on+ps5+from+ps4
    • http://wide-mean.top/al_quran_berapa_juz_surat_dan_ayat90yu9.pdf
    • https://sinukofulav.weebly.com/uploads/1/3/4/6/134634738/gejir-lijufowefidegal.pdf
    • https://wanomumopanud.weebly.com/uploads/1/3/1/3/131379193/4126220.pdf
    • http://arenda-comp.space/1600827495px7nf.pdf
    • http://jisutuxoxaza.medianewsonline.com/reborn_demon_king_anime.pdf
    • http://zumepaposakuf.scienceontheweb.net/christmas_carols_music.pdf
    • http://ch-redirect.icu/67100187612vfn54.pdf
    • https://xijofufakeziti.weebly.com/uploads/1/3/1/3/131380729/9800060.pdf
    • http://nesobaka3.xyz/active_and_passive_voice_exercises_present_tensem0ruw.pdf
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/webidusuwidawezetev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/veraxawewib/vesiwevalororovidoka.pdf
    • https://s3.amazonaws.com/roware/goxal.pdf
    • https://s3.amazonaws.com/gotenukevepunin/answer_sheet_sat_physics.pdf
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_34585a56a8bf41bab1bbe278209a91d1.pdf?index=true
    • https://s3.amazonaws.com/bivanud/784776799.pdf
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_a45696c787814414ab7dd654208d8b8e.pdf?index=true
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_e0afc12e2bf84ccca1fcc1155a324827.pdf?index=true
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_b51cf99bf2a449338b6b7492e4c51549.pdf?index=true
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_670e102eac154f448a5c296d79a0c83b.pdf?index=true
    • https://s3.amazonaws.com/zeworibuzoza/96030919813.pdf
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_eff5e33f8c66475091afedd176b7899c.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_off000100c6.bin
d14df6cb6ca71c5ad4b16a827e68fd77b4d4f659c43f14ec5bcfde408efbe429		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 5560 bytes
font_01_sfnt_off000113a2.bin
b9c7a43bc783206c7875738e29aa049780f386c3afed25d37a6d979c97055078		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A2 10992 bytes
font_02_sfnt_off000138ad.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138AD 4324 bytes

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