Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8a9b0c5819e268…

MALICIOUS

PDF

82.6 KB Created: 2021-03-25 09:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 565ace4cd268fbe710843c7a5fae1501 SHA-1: bd235e3099bbb8195cc7778061d3d1e8159d2d0a SHA-256: dc8a9b0c5819e2688dcdab12df055f5850b325d0f53b44783457f9ecd0eb2a06
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO poisoning or link farming to direct users to malicious websites. One prominent URL, 'https://pelibifir.ru/strik?utm_term=best+coffee+grinder+for+french+press+uk', appears to be a lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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/strik?utm_term=best+coffee+grinder+for+french+press+uk
    • https://lonunirixug.weebly.com/uploads/1/3/2/7/132710494/71358.pdf
    • https://wasavegod.weebly.com/uploads/1/3/4/5/134589575/davex-kiliz-nenejaloxima-sofos.pdf
    • https://vixananuxa.weebly.com/uploads/1/3/4/8/134881407/rawonolur.pdf
    • https://cdn.sqhk.co/zuzikewed/abjiwjc/xotegukibetefubavuwo.pdf
    • https://cdn.sqhk.co/zikufivol/c7wCjgH/mipozusejugiwikiminusos.pdf
    • https://zapeledi.weebly.com/uploads/1/3/5/3/135314532/tamoxiwomodilav.pdf
    • http://lebolugu.iblogger.org/58805066697.pdf
    • https://jilarikogezinuv.weebly.com/uploads/1/3/0/9/130969280/2070515.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://biwagevaku.epizy.com/airport_codes_worldwide.pdf
    • https://uploads.strikinglycdn.com/files/bf7b50bd-8cb3-464c-95c9-f860df614350/finding_missing_angles_worksheet_4th_grade.pdf
    • https://s3.amazonaws.com/suzixegazunow/answers_to_crossword_quiz_games_level_2.pdf
    • https://uploads.strikinglycdn.com/files/b961cc3f-ffec-47f3-8d16-3d89e4faa03f/90027971930.pdf
    • http://tusigod.epizy.com/pid_symbols_valves.pdf
    • https://s3.amazonaws.com/nakuzafol/bsf_recruitment_online_application_form.pdf
    • http://wiwekire.epizy.com/anti_graft_reform.pdf
    • https://s3.amazonaws.com/zabevog/lebijimopif.pdf
    • https://s3.amazonaws.com/wetowuzuxit/14403797641.pdf
    • https://uploads.strikinglycdn.com/files/2995e5bc-c083-420a-a1e9-bc8834b1ab9f/70990255700.pdf
    • https://s3.amazonaws.com/megodipewukitoj/aarum_kanathe_yaarodum_sollathe_song.pdf
    • https://s3.amazonaws.com/petubapizo/wogazewojisotedudaz.pdf
    • https://uploads.strikinglycdn.com/files/9a68e3ba-32bd-44c4-ae99-edb519fc2467/48939831312.pdf
    • https://s3.amazonaws.com/kisagoz/kipitotewakuxaro.pdf
    • https://s3.amazonaws.com/mipizaju/2942154051.pdf
    • https://uploads.strikinglycdn.com/files/b99e7ad5-26bb-4545-81fe-ee2257369265/how_to_reset_flood_switch_on_fisher_paykel_dishwasher.pdf
    • http://watekiz.rf.gd/89868502398.pdf
    • https://s3.amazonaws.com/kodipopujufipig/vendor_aging_report_in_excel.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105bf.bin
74db01e1ec35a2707f9ffab256095db70480dae01267e2638d6f5cacec838b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 5288 bytes
font_01_sfnt_off000117c0.bin
6a0102ee7d72427e78b4d8c763b7737bdd05c504d44dbe1f89f552384cd5b752		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117C0 10696 bytes

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