Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d7bbdfa1735d89…

MALICIOUS

PDF

67.2 KB Created: 2021-09-25 02:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 97f8af365256f000c344629d0ae1c89f SHA-1: a012c079431cc00fe4dc2c6ff8befc1a665769fc SHA-256: 83d7bbdfa1735d89415ac5ea3c93dc666845ed4d5bbfafea95e365b15276707b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and is flagged as a phishing lure with an image-only document and action trigger. It also functions as a link farm hosted on disposable domains, directing users to various PDF files. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=free+classic+solitaire+download+for+android PDF link annotation
    • http://seoaudytor.pl/userfiles/file/77544809717.pdfIn PDF document text
    • http://orenprom.com/img/account/file/13337960222.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/lewus.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/23900107210.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/naxufusopezokegoxatafote.pdfIn PDF document text
    • http://asid.rw/userfiles/file/96317003841.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/monorilenev.pdfIn PDF document text
    • http://emannsltd.com/userfiles/77092891450.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/85900609465.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/6198869972.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/sosilowefasibemizo.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/60700533961.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/52762385535.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/gitabenit.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332bd58b5f2---popoviweloferus.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/19616169314.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16133df6019092---89176070900.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/40230283312.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/zamivuvopak.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/xixuvolupetuzutebe.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/45475477084.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E8 10532 bytes
SHA-256: a2e185a2ee3335547ea009523e9d0c98e33b3690d0d8f68d77d08bbb735aab4f
font_02_sfnt_off0000db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 14612 bytes
SHA-256: 4d08f6261e29d9660c35c931cc6b49ba2d2de6093731a456f0b6300a7b5c62f4

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