Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c365098a9126aa…

MALICIOUS

PDF

95.8 KB Created: 2021-05-14 01:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3bd95548889c0905172702921c1222bd SHA-1: da5ea6d5e677ef738d0f7508db2f72a05293eee1 SHA-256: 23c365098a9126aa7a3d98832d63a7a91def57758ecdbb97f3611ebd2f7271f5
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the primary URLs extracted is https://seumenha.ru/strik?utm_term=cbt+worksheets+for+perfectionism, which is likely part of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://seumenha.ru/strik?utm_term=cbt+worksheets+for+perfectionism PDF link annotation
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/8102069.pdfIn PDF document text
    • https://tewabigonin.weebly.com/uploads/1/3/4/7/134760563/kepirovofepi.pdfIn PDF document text
    • https://katozela.weebly.com/uploads/1/3/0/8/130874493/lupulifuvesukejus.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/supugeda.pdfIn PDF document text
    • https://rizafosukozesal.weebly.com/uploads/1/3/5/3/135346652/6010683.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/1483188048.pdfIn PDF document text
    • https://nupinegudoxaxu.weebly.com/uploads/1/3/5/3/135350485/mixozi.pdfIn PDF document text
    • http://saroforati.medianewsonline.com/jorasexikisojuz.pdfIn PDF document text
    • https://vozexipazaxa.weebly.com/uploads/1/3/4/4/134444785/3720080.pdfIn PDF document text
    • http://tinubawolu.mywebcommunity.org/python_tutorial_beginner_to_advanced.pdfIn PDF document text
    • https://bumaxaxup.weebly.com/uploads/1/3/4/2/134235918/pogaxik.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/xewamejixolefaj/what_is_non_parallel_sentence_structure.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/cos_180-theta_value.pdfIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_949a1826fba64ca297743d90ca343433.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7298202a-dee6-4ec0-9735-6965668f24de/verbal_reasoning_test_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ee59fed-5ff1-4ed5-8133-0bb250a6fe30/78420792307.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/46235325466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a7c14c3-da24-499f-9d23-9f855e9edc88/37849761132.pdfIn PDF document text
    • http://laxufazekez.atwebpages.com/boston_market_menu_prices.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/fuvomafifowi.pdfIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_27ea7ad6e34b4ddcb00d0e0a4c1676d1.pdf?index=trueIn PDF document text
    • http://rodedewezijore.atwebpages.com/how_to_mix_paint_4-1-1.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_off00012d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 5120 bytes
SHA-256: e585e8613baf80cb70bc83d3cfd0ce5323c142a1cbdd905cfc2719ae92329aab
font_01_sfnt_off00013e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E69 10468 bytes
SHA-256: a77a746feedb94138748b842317865fe06e4fea0764469f2e1eb571e9190ddc5
font_02_sfnt_off00016224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16224 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378