Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e720971affdc75…

MALICIOUS

PDF

82.7 KB Created: 2021-04-08 05:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc52f5d974cd08efac08c3238d170f5d SHA-1: 2972258bd3a6a2b32e77bcbb7b33589b689906cf SHA-256: c5e720971affdc7587b319ee6e50db75fe629e167ee7733f7697938107569c29
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. One of these links, https://jumiwimov.ru/123?utm_term=everything+has+changed+sheet+music, is directly embedded in the document. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/123?utm_term=everything+has+changed+sheet+music
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/wufenoworopa-zugulez-xelol-jivunenatozo.pdf
    • https://cdn-cms.f-static.net/uploads/4423427/normal_60581bc9e9433.pdf
    • https://cdn-cms.f-static.net/uploads/4490523/normal_6011db88ef5e6.pdf
    • https://zisafidavilux.weebly.com/uploads/1/3/2/8/132814196/2050356.pdf
    • https://kefagifugujog.weebly.com/uploads/1/3/0/8/130813645/743e659e.pdf
    • https://nixawajumumija.weebly.com/uploads/1/3/4/3/134338940/868f5dafc.pdf
    • https://static.s123-cdn-static.com/uploads/4495393/normal_5fdfc1678f41e.pdf
    • https://fomikozifu.weebly.com/uploads/1/3/4/5/134511133/3310028.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sorogamat/mandala_animal_coloring_sheets.pdf
    • https://s3.amazonaws.com/muvevanepen/anaconda_2_movie_in_english.pdf
    • https://s3.amazonaws.com/tanapilamaxi/stephen_king_it_2_cameo.pdf
    • https://s3.amazonaws.com/savifin/change_adt_alarm_code_safewatch_pro_3000.pdf
    • https://s3.amazonaws.com/tazibabebamep/what_is_the_order_of_all_the_harry_potter_movies.pdf
    • https://s3.amazonaws.com/guxosa/37192806538.pdf
    • https://s3.amazonaws.com/nitirew/how_to_change_oil_husqvarna_mower.pdf
    • https://s3.amazonaws.com/gebukil/naniwepu.pdf
    • https://s3.amazonaws.com/sulasatevirexo/guitar_chord_chart_tab_form.pdf
    • https://s3.amazonaws.com/vazisi/63234960601.pdf
    • https://s3.amazonaws.com/lanorolowu/eddie_bauer_font_free.pdf
    • https://uploads.strikinglycdn.com/files/fd2d28ae-115a-457f-9b77-69741b2b89ae/how_to_make_rap_vocals_sound_better_audacity.pdf
    • https://uploads.strikinglycdn.com/files/5a68ca5e-60b8-48ec-a9f4-aeb5756695fe/wevodulinafukebokamere.pdf
    • https://s3.amazonaws.com/xowasosuf/what_is_the_main_purpose_of_chapter_4_in_the_giver.pdf
    • https://uploads.strikinglycdn.com/files/fa239f67-a13a-429d-adb6-0a968b8585a0/35999600326.pdf
    • https://s3.amazonaws.com/zarusegibitumet/84995836089.pdf
    • https://s3.amazonaws.com/fazujo/bubewojixasekipezul.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_off000104d5.bin
2334fa8fbf0a3c7e2f9a84a9e6a510cc341c952a7569835da795f9f474764bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D5 5440 bytes
font_01_sfnt_off00011741.bin
bc75407468ae6e8bc51e52763c29af981559ec084b8315c6ce21c75ec529ed4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11741 11084 bytes

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