Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb474caecf1ee792…

MALICIOUS

PDF

89.1 KB Created: 2021-09-27 23:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3e46bbf09dd9b7e54be285774f2959bb SHA-1: 6cb6827d14cbe5e817cc0eff613754fd567eeeef SHA-256: bb474caecf1ee792da5aaca7fd56cfac9df9ef8e85e193fc942a1142182edf04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to numerous suspicious PDF files. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://honeystraw.com/uploadfiles/file/75967587114.pdf In PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/24537566485.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/16244876577.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/pibomepabefafogokera.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/vujisexikodukovapige.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/44475245507.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/sedupebono.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/98414377396.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/36950249703.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/67657704061.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/57288458327.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/2231013684.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/51180174252.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/5479511171.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/44477160000.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/jemewafesasesok.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b29c86844b---2547857480.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/69434616093.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/muzuxadunuke.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/71196969957.pdfIn PDF document text
    • http://jiab.net/userData/board/file/tinudijijakuwuj.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/sijop.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/40347855058.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/41302371287.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/41610889732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=free+fire+brazil+server+download+apkPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/67663054095.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC73 10812 bytes
SHA-256: 066c981f0a9818d5e50bfc977b349e3a7114d905d624b130f01b6a8cbd051c81
font_01_sfnt_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 16816 bytes
SHA-256: f416eeb8efc2ef4a0c3cbbe9513d40c901239f3477295e191e56f4e06c643062
font_03_sfnt_off000115ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 25584 bytes
SHA-256: 0c2055036808d80c5c0c92ed5401727c0dd391edc254fbd126b3f71846678665