Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a10f5384329133…

MALICIOUS

PDF

92.2 KB Created: 2021-09-19 21:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: facd83c1c30142f4f57a46791015c3c6 SHA-1: dad021c63a531f2dba93069b77f0a26399360cdd SHA-256: b1a10f5384329133ba4d588f68253ce8269873d72e887a01194d4507247b8b39
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The PDF's structure and the presence of JavaScript suggest it's designed to exploit vulnerabilities or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • 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.
  • 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 http://ramenhajimetustin.com/uploads/files/55706872985.pdf In PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/69037084389.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/kikij.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/fuzowi.pdfIn PDF document text
    • https://senegal4d.com/contents/files/24724546211.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/kibixavakoxij.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/94200207275.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/negotikal.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/vatov.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/raguviwetezifimerax.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/88456370236.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109010334002716.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/fobelitepilerolas.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/dabizaf.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/15155186.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/acf88863bcd880e94370104b2027b4f6/45881327424.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/12848004568.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/96857343144.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/40928593788.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/45119720009.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/simulapajejijomaki.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/82087801995.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/demuv.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/d43977727a9baeb1d3a5da8047e77742.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/74739403467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=after+we+collided+2+full+movie+1234moviesPDF 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_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 11024 bytes
SHA-256: 138e4002915de50c28e8b2afb8fd8ab7978d797bf9a7bab14f314b7da0d121a6
font_01_sfnt_off00011374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B86 20752 bytes
SHA-256: af288d323212739ebb61131a56911500cc268cf50bb58946294292c17d0855d6