Malicious PDF — malware analysis report

Static analysis result for SHA-256 b293feaed9924d7f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 14:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 118a227f41e3858f0ff835e590d9a24c SHA-1: 0c5d3cfecfad568da98ffa0b25adf00f9641db9c SHA-256: b293feaed9924d7fe616e9ef47ef95f22f9cbd0d68c87eb453949953a48101bf
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to a link farm hosted on various domains, many of which appear to be disposable. This suggests a phishing or malware distribution campaign, where the user is intended to click on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://talk200.com/admin/admin/uploadfiles/file/58675633371.pdf
    • http://farmaciacogliate.it/userfiles/files/gokameruwotixutat.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/lj8kt2bngrc4gbs5ag4062ggc2/xiguvuputemajobevux.pdf
    • http://classtool.info/upload/files/fogabalubozenanumeda.pdf
    • https://balaji-technology.com/userfiles/file/79547014539.pdf
    • https://zlato-eu.cz/upload/files/fakuvopozi.pdf
    • http://rfinshaat.az/userfiles/file/34097994613.pdf
    • https://ladangmimpi2.com/contents/files/lidugonusakebil.pdf
    • http://velapower.com/glwh/UploadFile/file/2021092216590473499.pdf
    • https://weishinclinic.com/uploads/files/202109031232388930.pdf
    • http://centreforeffectivecoaching.com/media/file/ziwubideni.pdf
    • http://elitaliaweb.it/upload/file/bixoneduf.pdf
    • http://kamerton.nl/clientfiles/tumefaxerubepasa.pdf
    • https://carcable-bg.com/uploads/pictures/files/pinulokodexuk.pdf
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/mivumeririlo.pdf
    • http://patriabrno.cz/userfiles/files/8796088806.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415f9ddfb52---76085241504.pdf
    • https://nikosdimos.gr/userfiles/file/88375821123.pdf
    • http://uniondrygoods.com/fckeditor/userfiles/file/24526679170.pdf
    • https://indiansabroad.uk/userfiles/file/98856311803.pdf
    • http://webbolt.fono.hu/data/editorfile/65691110977.pdf
    • http://trieuduong.com/images/Download/19072364850.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/14260684364.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sky+control+app+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e331.bin
87adccf867e439ac97e84aaa4fcb174b51183fa4664383b3f0a3417528e52fde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 10488 bytes
font_01_sfnt_off0000fb2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 16792 bytes
font_02_sfnt_off0001133f.bin
e8847979d7ac638eebc9bec82ec4bdb53f5e12dc607e36956e1d5b7f2de73025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1133F 17560 bytes

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