Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80aa8f555ab298e…

MALICIOUS

PDF

94.5 KB Created: 2021-04-04 02:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ec0741b45b3b8400ed322aa62f12bc5 SHA-1: 7d51152c641ec701e7b2cfa4a5b3b45131dba200 SHA-256: f80aa8f555ab298e4c4dc8beb8596803835b5f0d8f3cacf7597a830347262259
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly indicates a phishing attempt, likely to trick users into visiting malicious URLs for financial gain. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to phishing sites.

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://xezojetit.ru/award?keyword=nursing+ethical+principles+pdf
    • http://demuxum.getenjoyment.net/chapter_19_biology_class_11_ncert.pdf
    • http://waralolojogeta.sportsontheweb.net/54079006922.pdf
    • https://cdn.sqhk.co/pigexebobe/cgiJvgh/dizidopujimilax.pdf
    • https://cdn.sqhk.co/zokirafuka/hae07wC/statistics_of_school_uniforms_pros_and_cons.pdf
    • https://cdn.sqhk.co/melipetoluf/cjdGTOH/maricopa_county_recorder_forms.pdf
    • http://wazepewazivulil.mywebcommunity.org/ncees_pe_practice_exam_promo_code_2020.pdf
    • https://cdn.sqhk.co/ludozenidi/ibtt1hi/98655789220.pdf
    • http://nuvagefo.medianewsonline.com/annuity_due_formula.pdf
    • https://cdn.sqhk.co/sidamebo/hbSjjgf/party_music_2020_list.pdf
    • https://cdn.sqhk.co/kusamika/ajb6ajd/wondershare_photo_collage_studio_serial_key.pdf
    • https://cdn.sqhk.co/tinulafi/dzfI3gc/free_virus_scan_and_removal_for_mac.pdf
    • https://cdn.sqhk.co/xakelafu/gfigfsM/samsung_galaxy_note_10_plus_ringtone_free_download.pdf
    • https://cdn.sqhk.co/bekutojeke/gjhgMij/whatsapp_viral_video_2019_download.pdf
    • http://liwitesuzemumex.sportsontheweb.net/kejogowafonixevemejewov.pdf
    • https://cdn.sqhk.co/xezufulozuwo/icLliei/minecraft_skins_editor_apk.pdf
    • http://bamirajewenexo.medianewsonline.com/vofosimidadixejon.pdf
    • https://cdn.sqhk.co/xubipoxeguza/qUhegcu/head_soccer_star_soccer_ball_games.pdf
    • https://cdn.sqhk.co/janawezexoj/hihA4hi/momisawejume.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_c4323ac49df3424181c26175199cadae.pdf?index=true
    • https://394fded3-a37f-45fe-8092-07e0884d2d31.filesusr.com/ugd/bdbc91_7458cf50fe3941bb80af5f365d28fc1b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013634.bin
fe84b52c1aa384f2fcbc62888732975e1243455912a1ab4a49ee86a213c31845		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13634 5388 bytes
font_01_sfnt_off0001488d.bin
15452628982a6d8079bb821491996f3447f2219216c5732a99eb0b56a2d83118		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1488D 10672 bytes

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