Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e701071e96db93…

MALICIOUS

PDF

77.3 KB Created: 2021-02-19 22:37:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 03c94daa3a91865975e03d4294a5e959 SHA-1: 2c27d2c028105827d419ab545972cdc1e9c0de7c SHA-256: 51e701071e96db9310de55db38a481edb52dc588b1611c3b132f754d89ed9dc6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=lopi+leyden+wood+stove+replacement+parts PDF link annotation
    • https://cdn.sqhk.co/zimopaji/jWND4m0/zutofirawepufoxoxaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407314/normal_5fd7ab3674903.pdfIn PDF document text
    • https://cdn.sqhk.co/bepoweruga/dmhaKhd/slow_motion_maker_download_free.pdfIn PDF document text
    • http://summer-italy.fun/afk_arena_cheats_androidsjsp6.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/0Vwp1DS/74535595379.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/o2Qhajd/call_blocker_free_apk.pdfIn PDF document text
    • http://milanomoda.site/your_grace_is_enough_lyrics_and_chords_key_of_g20xui.pdfIn PDF document text
    • http://whitetwo.space/crazy_games_zombs_royalee5tev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367640/normal_5ff0cf357b64f.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/XQEChjP/gold_farming_guide_wow_8._3.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/gcohbYV/dutejelevumi.pdfIn PDF document text
    • http://wutugavefezaza.22web.org/teginol.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/ihXrngj/recharge_mobile_in_nepal_from_canada.pdfIn PDF document text
    • http://kuvuradivikosef.iblogger.org/acronis_true_image_2016_full_iso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527747/normal_6028e92a53dcb.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/jc37dB3/battle_chasers_nightwar_ps4_metacritic.pdfIn PDF document text
    • http://idslim-italia.site/rentabilidad_definicion_segun_autores32og7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fotoburiwolof.rf.gd/do_you_capitalize_the_word_school.pdfIn PDF document text
    • http://welidigukiru.epizy.com/online_launchpad_music_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 5200 bytes
SHA-256: 8fff7dcdcd4a3ed5a435182157318b1efa3efe7b1f60021aa2448d6d2fa4e008
font_01_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 10220 bytes
SHA-256: 1b6ab29fbca3a7eefa8cc44830889a3c59a90c78104d211a8efa0c448e03c00e
font_02_sfnt_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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