Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85655b367c320d2…

MALICIOUS

PDF

75.7 KB Created: 2021-09-26 07:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8269d4c648314d83add20ce7aecfbeb SHA-1: bd637ae48c5868e0b9d8a971fc25353b7d93299f SHA-256: e85655b367c320d2b153066aafb1cc9f5dd9bdf3ed0daa2442f49f38239d44dd
151 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body and heuristics suggest a lure related to "cooking apk download", which is likely a pretext to trick users into downloading and executing a malicious payload. The numerous embedded URLs point to a link farm strategy, potentially distributing the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF advertises pirated movie streaming/download medium PDF_PIRACY_STREAMING_LURE
    PDF rendered text advertises free full-movie streaming or download using piracy-brand names or a 'full movie + download/free/watch' intent phrase — recovered after folding the styled Unicode confusables the campaign uses to hide those keywords from plain-text detection. These are disposable SEO-spam carriers that route users to malvertising, fake-player, and scam pages; the PDF itself is inert.
  • 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://108pizza.pl/uploads/userfiles/files/gazuxefukisovulalifutade.pdf In PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rofiku.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/lejegegiwefetinanuwugu.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/74481408618.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/70731535626.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/baxexaviborosux.pdfIn PDF document text
    • https://zufiks.pl/uploads/userfiles/files/nunerewifezejipav.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/54732914082.pdfIn PDF document text
    • http://turatabor.hu/media/81258264863.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/93422656790.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/wesajiduruj.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210903_594F8EB1811DAA4C.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/jaketozimiziworamifa.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/78263842467.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/naxifajupuramamezi.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/69407246498.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109032257515627.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/vakilomigafarax.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/19633930004.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c628c40a3---jugejof.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/fuligogi.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/tavasosibufatokanedoke.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/sababolu.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/7003648a246a314377e6f746253696f1/wabolosaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cooking+apk+downloadPDF 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 extracted file (font_00_sfnt_off0000af8b.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000af8b.bin)

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8B 10276 bytes
SHA-256: c1f12d78818402c35c902c00ae92c89b1676f2ac71f6dc5b785f79e459ba0158
font_01_sfnt_off0000c697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC697 17936 bytes
SHA-256: d7f9a882032c33e5e05bf4b28126e3f795028865bc176effd0fafdbea6083f46
font_02_sfnt_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 15264 bytes
SHA-256: 4f0eba8f86e6c15235b525dedfe4e5951df32cd3f85cfbec6c22deda12cb151d
font_03_sfnt_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1