Malicious PDF — malware analysis report

Static analysis result for SHA-256 de82d9d424fa9476…

MALICIOUS

PDF

78.4 KB Created: 2021-03-25 12:40:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5f22ff2ce284713e59a180e77287c499 SHA-1: 65c7908e24783c89a380daa9beeb7700caba8262 SHA-256: de82d9d424fa94769bb6ea88133e7163213f400f05008e3a38133bd06a0f9363
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirming the nature of the URLs. No scripts were extracted, but the document's structure and embedded URIs point towards a phishing or malware distribution attack.

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://pelibifir.ru/strik?utm_term=what+can+i+use+my+echo+show+for PDF link annotation
    • http://sdfafq.info/96240077320ck4ke.pdfIn PDF document text
    • http://checkmyscore.info/26353047632g9e85.pdfIn PDF document text
    • http://tuvosudokalidu.scienceontheweb.net/2971023487.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/32725507737.pdfIn PDF document text
    • http://forisawidokomor.sportsontheweb.net/champs_behavior_chart.pdfIn PDF document text
    • http://medyahanem.com/what_is_indigenous_knowledge_tok04uqw.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/chahdjb/battle_royale_simulator_codes_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/tjdqhgi/kekivakeratajativo.pdfIn PDF document text
    • http://copyright-security-ig.com/bb_z10_android_spesifikasiiodo7.pdfIn PDF document text
    • https://cdn.sqhk.co/bipuzojafa/gtjhaii/racing_vs_police_game_download.pdfIn PDF document text
    • http://boxberry-24.cc/digimon_episodes_in_hindi_online6e59z.pdfIn PDF document text
    • http://sdek-24.cc/human_psychology_101_bookttqz1.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/d8haVhh/sii_ic_dictionary_sl-_lt3.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/a865c211-aeb2-4a96-b421-366139771f36/hoover_elite_rewind_plus_upright_vacuum_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af6dcc9-a348-445a-84ad-78d248a6f7ff/what_does_mark_twain_argue_in_the_damned_human_race.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_62752ac50d1e44fda0402e52cf5d0dd8.pdf?index=trueIn PDF document text
    • https://2a04f01a-7147-4793-98aa-b59dc93e6f96.filesusr.com/ugd/efcdeb_e66a324f0c47452e9a64b7587568b9ee.pdf?index=trueIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_091e674162ce46c4bf4459bd6e8efffa.pdf?index=trueIn 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_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 5296 bytes
SHA-256: 471bd8b5aa298dab590e99e3dba3773b850da62514c5fec111d8584b805c58a3
font_01_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 11080 bytes
SHA-256: a5b3d14cb737a5f7dc6cebdce1218aaf6c84c09dc95b4f7d4b6e4a82d955e8ad

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