Malicious PDF — malware analysis report

Static analysis result for SHA-256 82673e39185c40a2…

MALICIOUS

PDF

70.9 KB Created: 2021-03-13 18:40:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a92035c160f642966e5eded60efabe2 SHA-1: d9becf32676f6fd9f4b62b22fa2a13a8897eaf29 SHA-256: 82673e39185c40a2b9650e8062751036565f2fd32f0f4c063f31cbe59eceed44
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting an attempt to drive traffic to malicious or deceptive websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=prestone+driveway+heat
    • http://zitosobuzozuz.22web.org/kohler_cv15s_carburetor_rebuild_kit.pdf
    • https://cdn.sqhk.co/nisugavu/ihVhb89/free_chess_download_for_windows_xp.pdf
    • https://cdn.sqhk.co/fenazijeguk/gfibRid/revenge_of_sultans_apk_update.pdf
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/d4f6e7.pdf
    • https://cdn.sqhk.co/lipetebo/mSIgfij/87239975199.pdf
    • https://cdn.sqhk.co/koroxofusino/2SJOGl0/walking_dead_zombies_pictures.pdf
    • https://cdn.sqhk.co/vilubofi/hfgd2ii/total_war_shogun_2_cheats.pdf
    • https://cdn.sqhk.co/demanajinu/jgwheid/83620371665.pdf
    • https://cdn.sqhk.co/dufubimaru/fjiSvWY/jenubizotabebutukuz.pdf
    • https://cdn.sqhk.co/kenipafitu/iidnEhe/my_disney_account_login.pdf
    • https://jonumupemusegiw.weebly.com/uploads/1/3/0/8/130874210/volitu-zidipawamu-ziwepejukoniraz.pdf
    • http://tukudetu.iblogger.org/pajivo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lojosikol.epizy.com/ghost_audio_sound.pdf
    • https://uploads.strikinglycdn.com/files/54dcd493-c98e-4fe2-97ec-8e54190dca2b/tabodumurarirus.pdf
    • http://lagozavisimodu.epizy.com/24093474227.pdf
    • https://uploads.strikinglycdn.com/files/94df1124-097b-4d17-82a4-2e475c4abd47/seth_godin_the_dip_audiobook.pdf
    • https://uploads.strikinglycdn.com/files/24929eb9-c584-4883-893d-b4cc4d2a879c/42232404597.pdf
    • https://uploads.strikinglycdn.com/files/3c7a2536-e8e8-4abc-9311-da9c97f88aa2/how_to_harvest_pampas_grass_seed.pdf
    • http://mojabumenir.epizy.com/bluegrass_gospel_music_s.pdf
    • https://uploads.strikinglycdn.com/files/5a15e967-9a54-443b-bff4-209c3879944b/que_es_una_propuesta_metodologica_de_un_proyecto.pdf
    • 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_off0000d656.bin
9769f6269b971a6bd1d3305d47af74462fc28bfeea1e3ae0cce8c3367f42f418		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD656 5136 bytes
font_01_sfnt_off0000e7dc.bin
13cdcd7edfbcc1999b371f3b122b7c05ed34909fc4db2627cb2890bde3418f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 11412 bytes

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