Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e483642393e7f4…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 01:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 81ac454bcf9bcd1ca8522939742bec03 SHA-1: 2ccd7b36e97183e3e959258e6b5bb2b08140b316 SHA-256: d2e483642393e7f43c519bd227042a70467f7610f65243754248fbd548c6ec76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains and utilizing UTM parameters, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://catamma.ru/uplcv?utm_term=ultimate+car+driving+simulator+hack+game+download PDF link annotation
    • http://boldogelet.hu/media/bafuvirakapezowidutu.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/36957392160.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/87411965539.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/pedonozomap.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/68398292544.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/59622531044.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/vitofuvaruzizak.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/96182287515.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/xuponorakulekagizamulege.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/86821244616.pdfIn PDF document text
    • http://elitvorota.ru/f/file/8284319870.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/25930160610.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/gijugovavewu.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/watobususuzofabididos.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/47114161596.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/35858378384.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/13628134606.pdfIn PDF document text
    • https://aashianarealty.com/file/nirupuluv.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109230049109455.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/munupikiwof.pdfIn PDF document text
    • https://coil.hk/upload/files/74829466720.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/28798759175.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/bofuzupovise.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/dabaj.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/wegusasix.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_off0000b275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB275 15620 bytes
SHA-256: 8275deee7dd626bb6775a26f6edb84acfb5c569fc2c039c9b9f3a6ca6b43a0be
font_01_sfnt_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 11168 bytes
SHA-256: 21cccc0bc941f69c55acd1440e1538eb2e1ea4a4aad9da1494453ab15a242c4e
font_02_sfnt_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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