Malicious PDF — malware analysis report

Static analysis result for SHA-256 977f433be8f3cea0…

MALICIOUS

PDF

88.0 KB Created: 2021-09-24 01:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1175e1512d8f2bea7d6db509ff31301d SHA-1: c775f1f67b58b38808a2440d18e79dd3d95b1905 SHA-256: 977f433be8f3cea01ef07ad849945631553d6a4f9586768ace9e36513d11553b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to phishing or scam content. The PDF structure and embedded URLs are consistent with a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=how+to+connect+android+tv+to+laptop+via+wifi PDF link annotation
    • http://kondicionery-lubertsy.ru/upload_picture/file/9334331008.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/fuvojonuwusinubumepofer.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/febaz.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/15230903145.pdfIn PDF document text
    • https://istanajp.com/contents/files/sowozemezoreta.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/pusozezunomugakorezenep.pdfIn PDF document text
    • http://askaudit.ru/price/luxifumokuwufojidiwakewi.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/xavorararaxipixawume.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/japadipotur.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/duvotexalenidelefagetuv.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/57304529557.pdfIn PDF document text
    • https://davaocarrental.com/images/file/21501921871.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/sekekojomi.pdfIn PDF document text
    • https://network-italia.com/file/tederaximoxawaluzis.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210920132255.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/47539874201.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613126c882d5b---fopusamemasi.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/puloweturopamipu.pdfIn PDF document text
    • http://idevoz.rs/files/dinakuxixakanedewezi.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/serujedeliwobudine.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/366fbce2536de999f54c72b86de59e1e/51435846397.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/26178215504.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/2851845796.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/dalolaboferejijiwajopek.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 18260 bytes
SHA-256: f6e307efab6fbeb017164474f56f2afaf2c51bc68f664b07df31ca54cae14028
font_01_sfnt_off000121a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B7 10588 bytes
SHA-256: 37d600656e3501c11978e485a64023424074276ee870972475c083b3974124a2