Malicious PDF — malware analysis report

Static analysis result for SHA-256 7849c0bbcba8303c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 03:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e5064eb3110da909a165392131866f8 SHA-1: adf032510467b49215b209893c6a75e966eae785 SHA-256: 7849c0bbcba8303c9f40ddce3b5030d603a2fabafa05b25349d2134ca5196e1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting an attempt to distribute malware or conduct phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/2798042290.pdf In PDF document text
    • http://2m-m.eu/userfiles/files/pelofovizefe.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090704361173499.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/tuxuvigifepuzirixejan.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/wupexanaguguzamibe.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344cfd5da1b---xavaf.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/mosigagiroladix.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/16310046899.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/54408849300.pdfIn PDF document text
    • http://cochemical.com/upload/files/44551584328.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/50343848931.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/894625565ab9761073e636eccc0ed68e/20466693612.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/67594978781.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/zejiduzek.pdfIn PDF document text
    • http://baove24h.org/upload/files/lilijiwi.pdfIn PDF document text
    • https://kokomanis.com/contents/files/digapogulozoxetubigal.pdfIn PDF document text
    • https://bem-sa.com/img/file/16235347259.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/76136680006.pdfIn PDF document text
    • https://codecs.ro/images/file/liwumoxa.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/76630576014.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/sigikamomupogelel.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210918012348.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/92189183200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=a+quiet+place+part+2+2021PDF 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_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 17980 bytes
SHA-256: 060dee5e976cde591c4cba85bf8e0a1531eb56eb712dbd945beea4df864ed554
font_01_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B3 10496 bytes
SHA-256: c25e3b519aa24cf4ca86555c4adc2d15687ecdd1e9d8cc5acf29eda9edfdc071

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