Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad7eea51c344402…

MALICIOUS

PDF

79.1 KB Created: 2021-03-20 05:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c1707aaeeb2c73b5c93ea819aab9c2c SHA-1: cb651557e06681c52d184a98ab333f3ef85545e0 SHA-256: 4ad7eea51c344402d135454fb05ff6fe0619147f3c9ac6f3aefa92e4242a6594
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. This suggests a malicious intent, possibly for SEO manipulation or to distribute further malware. The ClamAV detection and ML classifier also strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs implies a potential for downloading additional payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=purpose+driven+life+day+42+pdf
    • http://dkshlyap.ru/fhwa_culvert_design_manualhebz0.pdf
    • https://cdn.sqhk.co/rugofufol/hDjwq40/building_services_group_albury.pdf
    • https://cdn.sqhk.co/ketalidukepi/iduIyOJ/katitaritejazep.pdf
    • https://cdn.sqhk.co/jotepomi/ujiD8H5/vixukopurojefabum.pdf
    • http://design-kvartira.info/gopro_hero_3_battery_charge_timehdbie.pdf
    • https://tarakemutelomul.weebly.com/uploads/1/3/2/3/132303353/a5b85f4c4b.pdf
    • http://plsale.pro/sloan_flushmate_501b_recalljhhj5.pdf
    • https://cdn.sqhk.co/lovaxixifew/aesbjho/hyperspace_video_game_ps4.pdf
    • https://cdn.sqhk.co/zotipimesaza/dTha3jd/fowol.pdf
    • http://oneplusonemain.xyz/comparative_literary_analysis_essay_examplehc1u9.pdf
    • https://cdn.sqhk.co/xoxujagemo/uamgjih/carbon_nitrogen_phosphorus_cycle_worksheets.pdf
    • https://mokekisinuru.weebly.com/uploads/1/3/4/3/134366850/valuse.pdf
    • http://homearfes.com/platform_bed_frame_wood_queens7d0l.pdf
    • https://dinadexoliba.weebly.com/uploads/1/3/6/0/136091941/jinuja.pdf
    • https://cdn.sqhk.co/konajera/wrUhjjd/bobixurigumesuwewage.pdf
    • http://ritual-venki.online/how_to_clean_a_whirlpool_jacuzzi_tubllcmk.pdf
    • https://sobiwololisa.weebly.com/uploads/1/3/0/9/130969717/1432075.pdf
    • https://cdn.sqhk.co/tirewaku/gcp0eLO/easy_logo_quiz_game_online.pdf
    • https://lukijijuvuz.weebly.com/uploads/1/3/4/7/134742917/12b1d81518.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://965bd944-310b-4209-a71a-d16e45aaced4.filesusr.com/ugd/5f02e6_cb52dd9ca1ba48399f39da45b9287472.pdf?index=true
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_6e0dd3f7becc46868c1fbd548a4f4fd3.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_off0000f507.bin
59e040820a0c701132a43ff9c4982b056d6cddaa8ad7898cd96cf4b6a53ffab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 5416 bytes
font_01_sfnt_off00010798.bin
7f858b0e9def10ed69f224d8169e6d07d1a5206e3c434b729142b2800fdd8b14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10798 11040 bytes

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