Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d487af967ac4f6d…

MALICIOUS

PDF

109.5 KB Created: 2021-09-19 12:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b1febd8d7ef70c4be1a66d107c130a3 SHA-1: c1c90f2bbb1e4d8632382b9fc95422d3b3a55e2a SHA-256: 4d487af967ac4f6d72e7a366b874d578f8bd59b3bcdb9c07ef89aa3151e6fa57
166 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a high-confidence heuristic identifying it as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=pokemon+emerald+all+tm+and+hm+cheat+gameshark PDF link annotation
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/43226418501.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/65827870591.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/96395726918.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/430c154765f88a9e64f8ec5fbd16cad7/22704843525.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/94983023197.pdfIn PDF document text
    • https://fptica.ru/images/file/96118272282.pdfIn PDF document text
    • https://kimansion.com/uploads/file/dexej.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/gitizegexenusamiroladux.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/70994747429.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/48304471457.pdfIn PDF document text
    • http://geasit.it/userfiles/files/zaridajuxinivabimukituxu.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/zobawuvalisatisijifi.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/52167660171.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/85743674650.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/48201073647.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/fuwidijebobemurawowa.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/88357270723.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/44560206334.pdfIn PDF document text
    • https://12shio2.com/contents/files/85319094321.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/lujamufawu.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/buvidenarakuxonuli.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210913_162707.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/nazevurina.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/jezuxonevizesiwominefoba.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_off00014341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14341 19108 bytes
SHA-256: df2cb77c430686698dafd6203a78bc531e3f29b4ba27d25ae3d1755e309037c2
font_01_sfnt_off0001756c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1756C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D83 10816 bytes
SHA-256: b7ddff5ce6d97932b10702c3457cf006756d0b863ded20b0db07b2145c2cf0b1