Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4a15b1337ce709…

MALICIOUS

PDF

76.7 KB Created: 2021-04-05 17:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f98f08348be37727a226a5ce56e36412 SHA-1: 447d3f82f1d100e3cf82722b1215eed592b57db3 SHA-256: 5b4a15b1337ce709bad5e57fff33186ced9a026859be5f8805b3176cda3fb604
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to disposable hosting and potentially malicious domains, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded URLs are indicative of a spearphishing attachment, designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/award?keyword=electrocardiograma+definicion+pdf PDF link annotation
    • https://cdn.sqhk.co/rabataxuvax/jfhchhe/minecraft_download_free_pc_mojang.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/shcakjb/denon_audio_receiver_reviews.pdfIn PDF document text
    • http://familyit.info/28976057796wvykk.pdfIn PDF document text
    • http://trynon.xyz/7104255887mflkz.pdfIn PDF document text
    • http://raisinshq.pro/werewolf_dnd_5e_pcuaqqu.pdfIn PDF document text
    • http://airbin.top/nanomunojumulisebilofesif34hv.pdfIn PDF document text
    • https://cdn.sqhk.co/fosikikevo/eXJE0HY/suxigozakaj.pdfIn PDF document text
    • http://vashastrahovka24.ru/line_6_spider_iv_15_presets_listz0nbl.pdfIn PDF document text
    • http://graatorama.fun/xuxonafebizaverekogav7nd9.pdfIn PDF document text
    • https://cdn.sqhk.co/demanajinu/hbigGvu/knife_sharpener_electric_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/cjgif5o/lipadosoxamoxifutuwar.pdfIn PDF document text
    • https://cdn.sqhk.co/bezofusipow/gBljjif/funny_videos_try_not_to_laugh.pdfIn PDF document text
    • http://islta.fun/onn_portable_dvd_player_helplcv9z.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/md3xif8/sirojibenozukifir.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/fr0jnyO/hide_and_seek_apk_free_download.pdfIn PDF document text
    • http://trydouche.xyz/sebalufunedatiwilewulebsc77.pdfIn PDF document text
    • https://cdn.sqhk.co/rowunozimop/eyhjjbJ/greg_maddux_chicks_dig_the_long_ball.pdfIn PDF document text
    • http://kartaidatodemeleri.com/zovepizumedepinanavt73wr.pdfIn PDF document text
    • http://dom-bita.org/monsters_vs_aliens_susan_murphy_wedding45cxo.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/BQgiMkW/dead_town_zombie_survival_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/212a03f3-3a00-4427-94f8-22030598738d/73977343523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/448b7480-d6c8-40fc-ad2d-88a5bd6c3080/38250258721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78c4b9e0-17dc-4efb-a11e-1581da4bad21/el_poder_de_la_oracion_predicacion_cristiana.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 5252 bytes
SHA-256: 84e2f08cabbeb31718ab83da07afa367899930f98b03cd7b8e7adffa42596f98
font_01_sfnt_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 11696 bytes
SHA-256: fc9c99cdb167f3dd92a33981129501e24679476d8e96198c0fca1798b1b478ea

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