Malicious PDF — malware analysis report

Static analysis result for SHA-256 86efb6b47bdd7b13…

MALICIOUS

PDF

68.2 KB Created: 2021-10-05 05:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2f2a78247a02cf0b01f5931f0197b3a0 SHA-1: 527fe3699716eb7253ca6cf12abf134f2236e35b SHA-256: 86efb6b47bdd7b139655fc78330957dbf60aa1871ad251ec85cc05a76303a021
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and a clickable link to an algorithmically generated URL. The document body is heavily obfuscated, but the heuristics indicate a malicious intent to redirect users to external resources. The presence of multiple links to disposable domains and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/5ea19c652ffa7ad87cb54e2e04429950/dugedek.pdf In PDF document text
    • https://holcom-solar.com/webroot/img/files/36975932925.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/87531494361.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/31355999850.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/15999596812.pdfIn PDF document text
    • https://aildf.in/userfiles/file/10132241889.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/81251601299.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/10624760333.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/53329599394.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/zijevizazu.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/98946947084.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/zupurirekopotofasekotomi.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/dadadunufimaruloseso.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/17816660921.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/dugobuzuzofopoxunijak.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/varirozutavoxumosuxedutu.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/29422885616.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/60545371942.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/mugikuwamamozuxufonired.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/1526512546.pdfIn PDF document text
    • http://runo34.ru/attachments/file/26344953210.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615addd7ee541---papesodupaja.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/16710925030.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rivikezosezagifoburipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=real+life+examples+of+whistleblowingPDF 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_off0000af73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78A 11076 bytes
SHA-256: abf92f3b3295f145b16f4cbc1bdc2b77c909859e34dde71929b52dee71c910f1
font_02_sfnt_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 13892 bytes
SHA-256: 54814aabfe42d7272cde6cbac276fddfc4350686a3faac8daea76b2a27272a6b

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