Malicious PDF — malware analysis report

Static analysis result for SHA-256 61512f73ffc55f00…

MALICIOUS

PDF

82.4 KB Created: 2021-04-17 14:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 83714ec0a34a6eceaf5b99f1c95e2cae SHA-1: 81319c01a4b60843936f1ca24fa7ef3fca09a5b7 SHA-256: 61512f73ffc55f00b838f7ed7663d1a2dd5cf09f83b01b4f602fa6747a425c49
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to a common search query ('Why won't my mini fridge turn on'), suggesting a lure. The embedded URL `https://mezovuduw.ru/strik?utm_term=why+won%2527t+my+mini+fridge+turn+on` further supports this, as it likely leads to a phishing site or malware download. The PDF also contains numerous other URLs, some hosted on disposable domains, characteristic of link farms used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=why+won%2527t+my+mini+fridge+turn+on PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372358/normal_5fdf0c09918e3.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/gewhhbg/space_armor_2_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/gokitoser/gh7gi2y/chronological_order_of_the_bible_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_605c305ade1db.pdfIn PDF document text
    • http://autoupgrade.website/mamomobidzspe.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/kedabufomorabergb806.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvinudubuno/dheHJjh/download_game_five_nights_at_freddy_s_sl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478402/normal_6047256392091.pdfIn PDF document text
    • http://repair-foto.ru/speak_english_around_town_freebytt2.pdfIn PDF document text
    • https://cdn.sqhk.co/buzosefif/Ehdjc2U/brooks_ghost_11_running_shoes_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_601ebbd0a05dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458390/normal_5fd101d2b2905.pdfIn PDF document text
    • https://cdn.sqhk.co/fisejadiruw/eb3jdWo/39836004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503033/normal_603429b33a6bb.pdfIn PDF document text
    • http://wexypay.icu/abu_garcia_pro_max_spinning_reel_line_capacity4hgu1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_601e5fe4de4bd.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
    • https://s3.amazonaws.com/dudujopixejikug/5971208991.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/ayo_teo_rolex_free.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/chota_bheem_tamil_dubbed_episodes.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/sims_3_for_macbook_pro_free_download.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_off0000f5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 5024 bytes
SHA-256: 15044d67fdd98d2470dddee288132219dddc6d69a1f9227e7085c45f100eb223
font_01_sfnt_off000106c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 11004 bytes
SHA-256: 8fae17beb157b49c83b644b714f1ea7d9668ccc5625feeeac9f7713660c991c7
font_02_sfnt_off00012c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C83 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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