Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dccf681d9c91c73…

MALICIOUS

PDF

87.4 KB Created: 2021-09-19 15:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 269e9908fe728a88c814079f57cf32c1 SHA-1: a5d9debe7c8536e11fdb6deaacda3d00882d8133 SHA-256: 8dccf681d9c91c735cca0a2ea9a1ca59a5940805612501be546838e0ebb0935d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, one of which is identified as a link farm on disposable hosting. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and SE_QR_LURE heuristics suggests an attempt to redirect users to malicious sites, potentially for phishing or malware distribution. No scripts were extracted, but the overall structure and heuristics point to a malicious PDF designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://aldobini.it/userfiles/files/sutebexozirixun.pdf In PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/gobaramimagikonazen.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/giwudurokigolarajipow.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/feremotipolebixijo.pdfIn PDF document text
    • http://nanopena.cz/upload/file/japofojusegasetevezisune.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/29139878587.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/72425712498.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ut0f1aj7fhkvvdh48pc7msibk1/peramujamafulusovu.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/mejavilewoxekiwifexipode.pdfIn PDF document text
    • https://la-klamm.org/Files/files/87719065054.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/terurosakidexifu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/raluf.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/14979608103.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/68236541908.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/85635783477.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/40092558420.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/11662767901.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/jopojelirokiz.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/92268786603.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/ninumelipuna.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/sanamutoru.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161318c9bd91c6---89647274967.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090217082456.pdfIn PDF document text
    • http://spynet.gr/Administrator/uploads/userpics/OutPostImages/files/gogegib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+turn+old+smartphone+into+security+cameraPDF 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_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 11072 bytes
SHA-256: 3483c9b7d5161173bcfd0209f5025820f787056a0f236e07e98ae2b85a50b2a8
font_02_sfnt_off000121f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F3 17624 bytes
SHA-256: 254fcc64fdc44e1a942d9254887b082c09a47fc2703442f96616592682ccf347

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