Malicious PDF — malware analysis report

Static analysis result for SHA-256 24bd61c510c47c11…

MALICIOUS

PDF

76.7 KB Created: 2021-09-14 03:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2788c5082d11d7a4d833ab5cc7780112 SHA-1: 2d9a28e6f63a27d0b658cc5afa3a15710eeb326f SHA-256: 24bd61c510c47c11adc7668fc2425f248723b05b775bd0f9d773094a693f2c58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to redirect users to multiple potentially malicious sites, disguised as a download source. The presence of numerous external URIs, including one pointing to a suspicious domain with a UTM term suggesting a game download, reinforces the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=moto+x3m+download+pc PDF link annotation
    • http://jn-zhsc.com/upload/74409136071.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/wujeferuziruzo.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/monovijigifel.pdfIn PDF document text
    • https://limsurempat.com/contents/files/30350750411.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/24852204311.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/19130896245.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/92094930360.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/mozogekugof.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/fivewolef.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/47476765834.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/67954814617.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/dapeworosoxeto.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210909023730.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/sajilizeso.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/nunade.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/95611451986.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/80546593208.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/62551338235.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/94252112910.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sadoresazukewepuno.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/towizijirokuvigabirijes.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345ca24cfe3---88937230662.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/24786071098.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_off0000c7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 17908 bytes
SHA-256: 48958aa1e5148d06e7e65ace9db4aa8b1a9c9988a7602e958851fed9dde65561
font_02_sfnt_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 10536 bytes
SHA-256: 830d6a07bbba7e88b0a977003e68ccd2c75c70f5b238ec2fe2c1b4b3ec3198e7

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