Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af8744aa64a1a1b…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 19:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f174561df1fbc8b66c782ca9346dfd28 SHA-1: 4b7cb132d0b99c16257bf7a45f1cf25de638ed69 SHA-256: 4af8744aa64a1a1ba3bcca7fa2a59bef6ad593e175d2541a0c2d438673a0a9a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple unknown PDF files hosted on various domains. The presence of numerous embedded URLs, many pointing to potentially malicious content, supports the phishing and malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16132903c9f3ac---nidederanogexegagi.pdf In PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/nikarowesoxuwidovotilavu.pdfIn PDF document text
    • http://yongqingtech.com/d/files/65118371401.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/xixanajewudukam.pdfIn PDF document text
    • http://erex.hu/upload/file/ritun.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/56948810362.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/lidikoro.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/jujotezogezawi.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/4736727100.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/24003068852.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/pifokomewixuzax.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/83584907864.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/14306240445.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/54384608962.pdfIn PDF document text
    • http://baoveantam.info/upload/files/penexazodenegobaz.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/72355651402.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/62483908072.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/sorerowujize.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/raposuzawan.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/53540594213.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/navozugudakisijedebu.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/felovezogopopivazizusa.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/katipaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+long+does+it+take+for+jupiter+to+rotate+on+its+axisPDF link annotation
    • 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_off0000aded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADED 11172 bytes
SHA-256: e03eb9fc102026275225889ae1d703d6c5200661cf9844dd5ba62417554cac6d
font_01_sfnt_off0000c7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F4 14632 bytes
SHA-256: e1d8ea829dc9f7d79812a4e5c55976d948ba2d46d41bac1eed77c9da042f0fe3
font_02_sfnt_off0000ecdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1