Malicious PDF — malware analysis report

Static analysis result for SHA-256 de193453c90063ab…

MALICIOUS

PDF

73.7 KB Created: 2021-09-23 16:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b209bae98e97d36248d23464aac83ebb SHA-1: a336e812e6550ad35cc33effb89241fec0bfa0b9 SHA-256: de193453c90063ab19625dab8f0d80ec33c6502b882da04ddf6b9c72589c31ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are used in link farms, suggesting a phishing or scam campaign. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the attack pattern of redirecting users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=sonic+3+mobile+apk PDF link annotation
    • https://ingatlanfelugyelet.hu/uploads/file/dawonijozifowejewiz.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/roledikagozizopaxijagal.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/sikesobi.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/vakumawedusevuj.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/moxanafa.pdfIn PDF document text
    • https://guadix.co/ckfinder/userfiles/files/85295843390.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/xokox.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/pukolamivuxo.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/90277888121.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/wovuxutoninojikaraf.pdfIn PDF document text
    • http://imi.vc/upload/files/88134239399.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/kipuwov.pdfIn PDF document text
    • http://thevalleytrader.com/files/94201943041.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138551d6cdc3---54209237892.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/20987934766.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/fivinudanepogazival.pdfIn PDF document text
    • http://findacommodity.com/upload/file/36442918259.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/zawefasinuxoxi.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41238971254.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/toxovivep.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e30c5d2110---pokiw.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/gotetazufowipu.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/zafomajiviza.pdfIn PDF document text
    • http://zkpower.net/upload/files/22645735470.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_off0000baf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 17748 bytes
SHA-256: e90f41fe580e1867ae89a3559e280f9f82b594a1bff8f47323cb3f364f817b5b
font_02_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 10648 bytes
SHA-256: dc165997534441142eb37f7a69b161236189510cd4c5aa2cb21370907ef67b1a

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