Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a4d7fd7dfee0a1…

MALICIOUS

PDF

83.7 KB Created: 2021-04-28 00:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: eb86eb2338759ac05a4ad5aa29156db8 SHA-1: 5c5d02601858715c8d291c13548d55575436312b SHA-256: f5a4d7fd7dfee0a1b6a6b9a77501c26b6b6fffed09c5b8a28c0ee69e7bc4367f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to direct users to potentially malicious content. The primary URL, fokemale.ru, is suspicious and likely serves as a landing page for a phishing or malware distribution campaign. The presence of a link farm and the ML classifier flagging this PDF as malicious strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://fokemale.ru/strik?utm_term=marie+de+france+chevrefoil+summary PDF link annotation
    • http://copyrightshelpscenters.com/cuenta_conmigo_pelicula_completa_en_espaol_latino_repelisvzzcd.pdfIn PDF document text
    • http://repair-planshetov.ru/dress_down_day_at_work_guidelinesato7l.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/gjiEhh8/jedipafutewegiju.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/qwTHkhj/infection_rates_covid_by_state.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/FyNjb72/lojixozanepotedabitijad.pdfIn PDF document text
    • http://newser.site/fukogakipidigivawiwuktqzs6.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/PMNhggd/47944332078.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/BjTpRgf/pets_gym_shark_simulator_codes.pdfIn PDF document text
    • https://kumumejetosen.weebly.com/uploads/1/3/0/9/130969188/vemerodepifafudowas.pdfIn PDF document text
    • http://cloudmarket.website/fgteev_soundboard_for_freel6w3i.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/RPGUhe8/broken_bones_gamer_girl.pdfIn PDF document text
    • https://pujonavow.weebly.com/uploads/1/3/5/9/135958036/a0d6c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/64906565920.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/23203556673.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/bluestacks_apk_ykleme_baarsz_oldu.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/jibedadomovavamonedow.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/harrisons_principles_of_internal_medicine_book.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/goxigunufidijawujo.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/3396527460.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/26238356760.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/serenity_prayer_in_aa_literature.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 5228 bytes
SHA-256: dde06b1f38f59c582e66d9632f44f09f217984e41266c706595845ce86f51e6f
font_01_sfnt_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 13432 bytes
SHA-256: d57c5efa03e22bd7040b4bd5744a903e7f0ded5e099ff836f46a0c691f1d797a
font_02_sfnt_off00013321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13321 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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