Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73084e44fb1990c…

MALICIOUS

PDF

74.4 KB Created: 2021-03-06 05:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fd9eb405507ac1f27c5df267ea6a851e SHA-1: bee72cd28c98b85d0ad0f39bd95f5d09985f9080 SHA-256: a73084e44fb1990c85a999eebf9166b2d8c1cc8663bd331ac429a8da65e36cd1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs point towards an attack pattern involving redirection to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=how+do+i+change+the+thermostat+in+my+fisher+and+paykel+fridge PDF link annotation
    • http://waliduv.mypressonline.com/how_to_log_into_my_old_facebook_account.pdfIn PDF document text
    • https://gononazenikemad.weebly.com/uploads/1/3/4/4/134482012/3883466.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/jihjOFI/fruit_ninja_apk_old_version_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/xinefegepe/Hihjiii/classic_cars_for_sale_by_dealer_in_california.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/ahbz40z/best_brawler_brawl_stars_2020.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/the_jewish_japanese_cookbook_and_how_to_raise_wolves_wiki.pdfIn PDF document text
    • https://jawuwokobot.weebly.com/uploads/1/3/1/3/131381435/6c31af087.pdfIn PDF document text
    • https://gokulibom.weebly.com/uploads/1/3/4/2/134266198/2a0fe.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/hgsWgkq/add_border_lightroom_cc.pdfIn PDF document text
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/sevovidorelen.pdfIn PDF document text
    • https://cdn.sqhk.co/lizuxutagisu/fjdHYgc/bitopawumiwek.pdfIn PDF document text
    • https://vufujisuwe.weebly.com/uploads/1/3/1/4/131437295/nigena_lixedipelid_vomilul.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidimewako/hjDv6gd/budget_car_rental_additional_driver_fee.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/4jgjc5N/worgle_live_broadcasted_word_game.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/bejaweg.pdfIn PDF document text
    • https://cdn.sqhk.co/jawosuzexe/sCaJuhj/yellow_wallpapers_cute.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zewukiro.epizy.com/88425202678.pdfIn PDF document text
    • http://pavabiza.atwebpages.com/3141405196.pdfIn PDF document text
    • http://bagitokukuwulo.epizy.com/microsoft_project_2013_user_manual.pdfIn PDF document text
    • http://nadanopo.rf.gd/bawutimi.pdfIn PDF document text
    • http://popofisofol.myartsonline.com/rock_pocket_mouse_activity_answer_key.pdfIn PDF document text
    • http://xuxeworopegofu.epizy.com/fishing_hook_tying_machine.pdfIn PDF document text
    • http://xobofob.rf.gd/electron_configuration_lesson.pdfIn PDF document text
    • http://sukufitax.epizy.com/67395649283.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_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 5788 bytes
SHA-256: dcd0deda1a229b5b7f9116ec29e4482d7a1aaa2135eb74524c4520b0c0dfbcc1
font_01_sfnt_off0000f66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 10932 bytes
SHA-256: 795c10cc0cabdf8c05568b8f2fd8d67b0f033c1359518873bd4a590752dfa6cb