Malicious PDF — malware analysis report

Static analysis result for SHA-256 444b9205b758c684…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 23:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3be82d1e0797b59d27fa48a245dc3031 SHA-1: 9e5ece0cd9bc9e134fa0073058556be91bb832be SHA-256: 444b9205b758c684ddb4e0a5c0709ca63d3587c43b231092147e4004b3a99f98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=snow+white+and+the+huntsman+filmyzilla PDF link annotation
    • http://vstarmp.cn/upload/files/20210913_210651.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/97309701672.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/91106008668.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/zezokilazesuduxokamoxune.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/gokunosowebanedeko.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/64477266767.pdfIn PDF document text
    • http://asqcert.net/files/files/febofanesiluwasexebadota.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/davaruwitozisezozobumebe.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/85908676473.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/tuzupolenerinonesokusuxu.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/rabufarurez.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137a2529c0c4---gokotaxalixoxorarir.pdfIn PDF document text
    • http://lg-palette.com/upload/files/720532464.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/wibor.pdfIn PDF document text
    • https://people11people.com/uploads/File/45272662687.pdfIn PDF document text
    • https://adikkedua.com/contents/files/lotobixafid.pdfIn PDF document text
    • https://geniodelweb.com/file/67246043485.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b4cea821bb3b431848f6d938e88d2108/topefajadivitobejinezaro.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/56748200539.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/46455684075.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/xuwezukevugetelogogawiv.pdfIn PDF document text
    • http://mlead.net/images/e/file/72227297678.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_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 21424 bytes
SHA-256: 0d24dce6b2b61446ec2727bb64779b8bb23068c9ec571455905d3a569edac474
font_01_sfnt_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 10952 bytes
SHA-256: f606d3618329cbb7de70d514c03f67be28bc16185aa5c591105857afc432b0e9
font_02_sfnt_off000128a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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