Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef1638a78beb133…

MALICIOUS

PDF

131.1 KB Created: 2021-03-14 09:15:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b07709d59ac5d13c7960964e00c91bf SHA-1: 816670c05c7f4030e3e299fdbb7d692bb06a0d5d SHA-256: 4ef1638a78beb133f392dc0bc9d7b0f972b6db700b624cf37c4444e36630419d
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of an advance-fee scam, as indicated by the 'SE_ADVANCE_FEE_SCAM_LURE' heuristic. It contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings for unrelated terms, as suggested by the 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL identified is https://botokaw.ru/award?keyword=audre+lorde+poetry+pdf, which is likely used to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://botokaw.ru/award?keyword=audre+lorde+poetry+pdf
    • https://cdn.sqhk.co/letabuner/ajiKieL/75146711584.pdf
    • http://muzibatixabu.mypressonline.com/audacity_girl_meaning_in_hindi.pdf
    • https://cdn.sqhk.co/vumorumuvogi/iifVzig/dibartolo_bakery_hours.pdf
    • https://cdn.sqhk.co/rabovafom/d94iiha/chocolate_cupcake_recipe_from_scratch_easy.pdf
    • https://cdn.sqhk.co/numokafas/SVWibaQ/la_liga_golden_boot_winners_2020.pdf
    • http://tosatosekux.22web.org/is_civil_disobedience_effective_essay.pdf
    • http://dejivuxa.mygamesonline.org/englander_pellet_stove_manual_55-shp10.pdf
    • http://zoxuruje.sportsontheweb.net/78954775262.pdf
    • http://damenetapep.iblogger.org/fagumimula.pdf
    • https://cdn.sqhk.co/xegunorasu/hgjg3L4/79893060682.pdf
    • https://cdn.sqhk.co/kazamepa/hihVGhe/sniper_ghost_warrior_2_xbox_360_split_screen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jisijuvod.myartsonline.com/weber_genesis_ii_e-310_parts_list.pdf
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_456fce2c993a4373858f5beab52d4948.pdf?index=true
    • http://pipovafalalum.rf.gd/u_dictionary_for_android.pdf
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_a51172a4c7d440029b7fd9eedf8faef4.pdf?index=true
    • http://junebipizazob.epizy.com/python_string_to_datetime_24_hour_format.pdf
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_f46ec70c91324c82bb271e451a61eb53.pdf?index=true
    • http://gozixug.epizy.com/bank_job_preparation_books_free_download.pdf
    • http://naxakise.epizy.com/muzasuna.pdf
    • http://safatezep.epizy.com/dirt_devil_vacuum_repair_near_me.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_off0001c576.bin
3fe5da952f950d3713dfdb16c56bc5572127f7d92296cbfeae8d911778691e29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C576 4740 bytes
font_01_sfnt_off0001d5af.bin
6740da3ece0b681909930a488b609dd06d793a9ef7beeba109dfe2e8914dd1ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5AF 11832 bytes

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