Malicious PDF — malware analysis report

Static analysis result for SHA-256 18028897c32f8fa7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 16:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 492a215ac8db9a6bc1d94f7ef674acbf SHA-1: 7e7a4ac233a46ed4b16cbd43d174ea4b83df0fa4 SHA-256: 18028897c32f8fa7620d31b5cfaa0dd1f58879262125a5b710bf5beb52c37695
154 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. The presence of numerous external URLs, including one with a 'utm_term' parameter suggesting tracking, and a heuristic indicating a link farm on disposable hosting, points towards a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains elements that suggest a deceptive interface, possibly including a download button lure, further supporting the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=game+booster+no+ads PDF link annotation
    • http://www.binghan.my/userfiles/file/43736489487.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/xukamolixivowexem.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e3f3817e9---wulaxadovazefotif.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/8995756619.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134886b1c85f---xiweziruwipa.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/bipajiwonuxekot.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/66390704870.pdfIn PDF document text
    • https://digireg.lu/upload/koxajutozakaz.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/kizijeg.pdfIn PDF document text
    • http://citra.cl/userfiles/file/73681353239.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/bejewoxepokosojowokisiga.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/newiwofagi.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/10254586475.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/jisabavodakaxafozajalu.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/nufetuperabubiwera.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/88278646649.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/podisemalefesesal.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/21349849374.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/bavekumir.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/35640449662.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/67107736862.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/5201571765.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202197187454852.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210908182908.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/nitugejikemukuvuginur.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C2 10448 bytes
SHA-256: 9490f8dc2629907b22503833bce2159097abdce2c510d4b2681b7f066fc0809d
font_01_sfnt_off0000de7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68A 1828 bytes
SHA-256: c65da4501f80be219574418733c77cb401adeeba023536fee640a710fe7be6ed
font_03_sfnt_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 20120 bytes
SHA-256: 5819ead72b59053fe388ca0bafc2146b3814a55a5ea6fb10ec8106203262bfa2

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