Malicious PDF — malware analysis report

Static analysis result for SHA-256 257897b24df3db6e…

MALICIOUS

PDF

77.9 KB Created: 2021-04-05 05:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 366f4144b63af2750e26e8ab429ffc6d SHA-1: 69042c2351a651150a835f9943551dbc73e533ec SHA-256: 257897b24df3db6e814f5be5a78f23e1996902e28df0c68aa9196c330a5a867e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a phishing attempt, with a high ML classifier score and ClamAV detection. It contains numerous external links, including a primary link to 'https://xezojetit.ru/strik?utm_term=how+long+does+a+ryobi+40v+4ah+battery+last', suggesting a lure for SEO spam or phishing. No scripts were extracted, but the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 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://xezojetit.ru/strik?utm_term=how+long+does+a+ryobi+40v+4ah+battery+last PDF link annotation
    • https://cdn.sqhk.co/nozujeraguje/ihhjrPC/60062718223.pdfIn PDF document text
    • http://usesucre.pro/westby_symbolic_play_scalelsi6b.pdfIn PDF document text
    • https://fozaronu.weebly.com/uploads/1/3/5/3/135349809/55c7a2680.pdfIn PDF document text
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/4d9cc94482a.pdfIn PDF document text
    • https://xizulorojude.weebly.com/uploads/1/3/5/3/135391297/9a1a2975.pdfIn PDF document text
    • https://ramoxibe.weebly.com/uploads/1/3/1/6/131636726/kipizowulur.pdfIn PDF document text
    • https://rifusefabizavi.weebly.com/uploads/1/3/2/3/132303317/8918808.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/4551395.pdfIn PDF document text
    • https://cdn.sqhk.co/fomolunuvufa/iggdhhF/marvel_contest_of_champions.pdfIn PDF document text
    • https://vomagorawu.weebly.com/uploads/1/3/4/7/134720662/5bf82ffccc242c2.pdfIn PDF document text
    • http://theraisins.pro/bob_evans_menu_prices_logan_ohiocgaoc.pdfIn PDF document text
    • https://xisifogobodi.weebly.com/uploads/1/3/4/7/134735845/8087298.pdfIn PDF document text
    • http://it50disconto.info/loretosexuvapivuht3j9.pdfIn PDF document text
    • https://cdn.sqhk.co/sadudolamom/jhgjdhj/pigiv.pdfIn PDF document text
    • https://cdn.sqhk.co/kanizubepa/iddjeji/basic_interview_questions_on_java.pdfIn PDF document text
    • http://hustlinmoney.com/61118993633584b6.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/22139750-7b83-43f6-8a9d-31e39718ab4f/15739166491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e1b0fd3-4b8d-449c-8679-a0e66df78161/p90_exercise_routine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9902b24d-47bc-46f2-92e9-26b2900dd1b9/84490752389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156e7bfa-ccb6-400c-b892-26fdba528029/10308810518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b54241-80f9-4b0b-9f0e-93d094fe5d0b/33344458440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba69cc6e-a19e-4b0c-b8ac-7400576e7181/cambridge_ielts_9_listening_test_2_section_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f996bd70-6820-4477-95dc-570c88696f32/hp_deskjet_f4280_price_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb37942-cda8-4bd0-8769-a5774ae0a88e/8388203256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95633567-ce7c-4ad9-80b4-fa42e788d7cc/how_to_fix_squeaky_dryer_ge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7bb6509-f48b-41d0-948a-d1c821762870/what_is_the_author_trying_to_say_in_the_yellow_wallpaper.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_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 5672 bytes
SHA-256: 6fcc03528dd84ddd35681fbe01a79d40da6483506e337d0f30d60c929925a2f3
font_01_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 10872 bytes
SHA-256: 448b0cac8ea8ad4db287bd5334b7cc8fe7322ad891d3c5a647ccb3dbae098f78

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