Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd534152de890ecc…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 21:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f2277d9b6ba178ad80ac8dcd26d23c29 SHA-1: e4daabcfbf8d6007cec7221788f8018864795064 SHA-256: fd534152de890ecc596bb328cd44c3db22e9190c96fc8388bece1cde3f2796b4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of external links, many pointing to algorithmically generated URLs on disposable hosting, indicating a link farm or spam distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://bsp-oblspl.org/ckfinder/userfiles/files/berugiwipefegitomofix.pdf In PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/83433276657.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/47005834518.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/gizerajiselol.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/43841943024.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/33501467996.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/43750976963.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/rezisanenubo.pdfIn PDF document text
    • https://biocoils.com/img/file/bepej.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210905145922.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/72637546749.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630594334_1.pdfIn PDF document text
    • https://lorus.rs/files/miluli.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/56703b29975ebd21613e6167958c3037/44623397747.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/58758902726.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/26880550346.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/23731124093.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bfaf43f9e---pemabomidomuxu.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/14390910555.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/11189992158.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210904_101821.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/91076468417.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/tananedariz.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/bodapurijogasuk.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/vetivozor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=tubemate+2020+3.3PDF 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_off0000d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 18164 bytes
SHA-256: 512fd955acb3d1a15d1c446c604b84d8d8cc142420fc0fccf0c4a68e09df89c3
font_01_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 10320 bytes
SHA-256: 469ecb77b92393c300b394bc3d9beabbc7eb0610ae139bae25a0d9e7da48607b
font_02_sfnt_off00011ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1