Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36059a03f60763c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 22:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0f6cffc809734164fb66e5f5431e89d8 SHA-1: a39eda61ccdf3cc50caf68a7187ced8e2a30c84d SHA-256: f36059a03f60763c778273c529922095ed65fe7bc412298c2b591cdb1fa28c56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is part of a link farm. The document body is unreadable, but the presence of numerous external URIs, many pointing to disposable domains, suggests a phishing or SEO spam campaign. No scripts were extracted, but the PDF structure itself likely contains exploit code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://tensoinox.com/userfiles/files/85581590922.pdf In PDF document text
    • http://interiorconsignments.com/media/file/zisajezobutijegukik.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/89196122371.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/vemutoludotuki.pdfIn PDF document text
    • https://hklh.vip/data/attachment/file/81157501962.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/vulizipabominosesufijogew.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/rutogaw.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/87637489432.pdfIn PDF document text
    • http://namngonviet.com/user-/files/tegat.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/20948831524.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/netajamotakowiz.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/18454578079.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/02f7a5dac2bd2dd31cfa65161059a3a2/nebub.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/5758089306.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/tigetiponugogibajan.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/gekofuvoxogepiwawirujebo.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/sodefiteze.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/15657210881.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/naxifajupuramamezi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f309e9f7bc---sekalazagu.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/78248381703.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/52538852475.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/28666241712.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/bakivit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=scorpion+season+1+episode+1+putlockerPDF 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_off0000b135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB135 16264 bytes
SHA-256: b64b203ee79c0654a6ea67e8fa1df0dbef883d455e0c417e88df6ca47a9743e8
font_01_sfnt_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 10828 bytes
SHA-256: e32d12ea8663734aa455f1d059f6965a381fdac3bbd5a6d030cb0909e6540b7a

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