Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb1cdf2a4475c5e…

MALICIOUS

PDF

76.4 KB Created: 2021-04-09 01:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 75cc75d36fb575256a1eb309b7206f92 SHA-1: b1f6f9afbec5804f367c5195e084177e264f7e20 SHA-256: 1fb1cdf2a4475c5e02ac93977185a28060dd1db6d02fc9414257d12439ec1116
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=on+my+honor+i+will+try+to+do+my+best PDF link annotation
    • http://duwelizub.mywebcommunity.org/dbt_borderline_personality_disorder.pdfIn PDF document text
    • https://bowavimizise.weebly.com/uploads/1/3/1/0/131070713/zobutanulekixap_modipudunoval.pdfIn PDF document text
    • http://igbusinessabouthelp.com/piano_sheet_music_harry_potterwm1re.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/igdgcBZ/australia_immigration_form_1229.pdfIn PDF document text
    • https://gipafefigemer.weebly.com/uploads/1/3/4/0/134097902/fojefitalematikopa.pdfIn PDF document text
    • http://pebonemariv.mypressonline.com/vuxogigikedagoda.pdfIn PDF document text
    • http://ogranifruit.space/xinadiwozadawunije6.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/jcqJjj7/vevupulijikabirupu.pdfIn PDF document text
    • http://paselon.getenjoyment.net/intro_test_b_dressage_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/lajakukilo/8hghdjf/cruise_critic_reviews_oceania_sirena.pdfIn PDF document text
    • https://vufufibujirefe.weebly.com/uploads/1/3/4/3/134355905/491200e.pdfIn PDF document text
    • http://mon-cmb.best/479158274154q8k4.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/GieUTM4/lynx_lake_lodge_boulder_junction_wi.pdfIn PDF document text
    • http://danoguvu.medianewsonline.com/92882265392.pdfIn PDF document text
    • https://cdn.sqhk.co/wozulifudon/k1hjFCs/bibliography_mla_format_generator.pdfIn PDF document text
    • https://cdn.sqhk.co/tekunipifob/hikicyA/74018998048.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fusifovizit.rf.gd/49968902243.pdfIn PDF document text
    • http://todizegi.epizy.com/80249831933.pdfIn PDF document text
    • http://paferiw.epizy.com/the_vanquished_generals_and_the_liberation_war_of_bangladesh.pdfIn PDF document text
    • http://tikikenuf.epizy.com/dictionary_of_cultural_literacy_online_free.pdfIn PDF document text
    • http://getetir.epizy.com/8th_grade_reading_staar_test_2015_answers.pdfIn PDF document text
    • http://xidalagep.myartsonline.com/kogirekigagawutefe.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_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 5216 bytes
SHA-256: bebd12f9570a6bcf90adac513a200f946fabb9519dffb0cfbd55b4ba4903c97d
font_01_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 10908 bytes
SHA-256: 73b78adf47dede4b5daa85ef75cdbdccf92c4a3d81dc83be93a2d21592631c9d

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