Malicious PDF — malware analysis report

Static analysis result for SHA-256 71597f25cc6627c4…

MALICIOUS

PDF

78.3 KB Created: 2021-03-19 19:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 87b338a7e4da1a49a8fb29085a4cbaa6 SHA-1: c1f568c8e9d1f037b4043e96c378a2e46aa9216d SHA-256: 71597f25cc6627c4d570f6eebe8e829cc23a2071e41bc7d66556e91fa7edc708
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and redirector infrastructure, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The document body, though heavily obfuscated, suggests a lure related to a product manual, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=sharper+image+digital+camera+binoculars+manual In PDF document text
    • https://cdn.sqhk.co/kosojevevoxo/i1x21ii/64424242987.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/jfhcid0/phoenix_airport_car_rental_deals.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/fjezIsD/50397493022.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/dmYsiah/xelukaloge.pdfIn PDF document text
    • http://goodshopsales.xyz/how_to_write_a_diversity_statement_for_medical_schoolyp1cg.pdfIn PDF document text
    • https://cdn.sqhk.co/supuzeren/hdjfjib/83529145199.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/idOTjew/laginu.pdfIn PDF document text
    • http://white-x.fun/bernina_1090_manualv82y2.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/CH5jfPC/audio_pro_drumfire_wireless_multiroom_speaker.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/g11pyih/first_aid_training_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gixezovof/hdhdH8G/5204553564.pdfIn PDF document text
    • http://b0xberry.online/4742111430hbu8o.pdfIn PDF document text
    • http://chestlune.online/willy_wonka_bookty7bz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zabevog/29105594224.pdfIn PDF document text
    • http://zezunas.epizy.com/bicycle_thieves_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63e4b51e-897f-47d7-9af9-25048767adad/was_it_a_dream_lyrics_30_seconds_to_mars.pdfIn PDF document text
    • http://sekekubonigav.rf.gd/boost_app_apk_2019.pdfIn PDF document text
    • http://zosajirigo.rf.gd/fapigejurofifug.pdfIn PDF document text
    • http://penisidisipifo.rf.gd/pioneer_elite_60_inch_plasma_tv_stand.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/51286443660.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/coleman_powermate_2500_watt_generator_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/carcel_federal_en_puerto_rico.pdfIn PDF document text
    • http://zubixuguse.epizy.com/jasper_reports_is_empty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7a255f3-28fa-4176-bf9b-4e9d2e2ff01c/zombie_blastoise_pixelmon.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/why_is_my_washing_machine_leaking_from_underneath.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_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 5728 bytes
SHA-256: 570e960edcd406001e4d64f8a884d6a0f882ff56eb4274d2d6e102e0b8a86909
font_01_sfnt_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 10932 bytes
SHA-256: ab1cb3dbd197bb7f970de797e96e121de7a47c22fa3f79fc7a9712e2b1167f1f