Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc75f03334be9c75…

MALICIOUS

PDF

97.1 KB Created: 2021-04-03 14:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e7aa45123c68bd491b4fadf8832deb8 SHA-1: d4b7c3f11e23a7bae81f8f306f744d0940907de3 SHA-256: fc75f03334be9c75511be0da24fb4daa978f2b5e4092f9d4dff11a3f3feec83a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' pointing to suspicious domains like 'dafemum.ru' and '1cats.space'. ClamAV also detected it as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the structure and link farm suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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://dafemum.ru/award?keyword=computer+programming+languages+pdf
    • http://1cats.space/macbeth_act_4_scene_1_study_guide_answersxd09l.pdf
    • http://afracheat6.xyz/ejemplos_de_actas_de_reunion_de_trabajoygtaf.pdf
    • http://1xbet-registr.site/6360510884xtb6j.pdf
    • http://trylait.pro/nasb_vs_nkjv6kyai.pdf
    • http://kamini33.ru/ronipu3f69s.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sinamozagemoger/pemezerutijopidonadifeb.pdf
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_61be4984af214465a1e8d0fdbf5f531d.pdf?index=true
    • https://s3.amazonaws.com/zevutebulaworel/beeswax_candle_making_sheets.pdf
    • https://s3.amazonaws.com/dapekufoxiraku/fimipafuzelewotugux.pdf
    • https://s3.amazonaws.com/mejigavukolu/life_after_death_christianity.pdf
    • https://s3.amazonaws.com/jenisozazewubo/41709314300.pdf
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_45452360b0b44356bb3bc035818ce498.pdf?index=true
    • https://s3.amazonaws.com/geraromu/sweat_play_by_lynn_nottage.pdf
    • https://58fabbca-0322-4868-a582-948aa19840f9.filesusr.com/ugd/93748c_5c73921460c14fef8237405b34d474b4.pdf?index=true
    • https://s3.amazonaws.com/vovuzize/labubevidufopogebit.pdf
    • https://s3.amazonaws.com/niporofez/ebay_android_app_no_notifications.pdf
    • https://s3.amazonaws.com/jobavo/all_physics_formulas_of_class_9_and_10.pdf
    • https://s3.amazonaws.com/sobaketemu/technivorm_moccamaster_sale_canada.pdf
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_ad7cde6057b14e18a1520c6334468331.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011965.bin
7278ed2924031f7cb48accbee7c336b7b30468630b79de79cd3589013bd2d2c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11965 4016 bytes
font_01_sfnt_off00012791.bin
74f1c1f7eddc462154d556cc5f84d255f394afd633442894b4f3088b9b69ca80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12791 5268 bytes
font_02_sfnt_off00013960.bin
41a1724ff9e83b4916e658f31dacf348ccd9432222dd23f1213f375750597e09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13960 11612 bytes
font_03_sfnt_off0001615f.bin
f469c5aa689aa4c1965481b78cfaebbf1c3ebdad2306c7067134b7b4aaa0addd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1615F 16164 bytes

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