Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a0c92c45727f56…

MALICIOUS

PDF

99.4 KB Created: 2021-09-17 16:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2972b92c16f43307821108a2110f34f SHA-1: b060448aaca3bcd0d9f51c30d996fb2b08ad17c9 SHA-256: 74a0c92c45727f56de6cf0ce6ab2e7c643315e19ba9ba392d10c418953fab287
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to disposable hosting domains. The embedded URLs likely serve to redirect users to malicious sites for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://inwebjor.ru/uplcv?utm_term=mlaatr+raggedy+android PDF link annotation
    • http://inwama4.vn/webroot/img/files/68639154196.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/49561878059.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/kifinozixuwuvakubil.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/13794139530.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/wutub.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/121845401157.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/91900788944.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-04/images/files/1558984174.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/10468699238.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/88575395125.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210908141358947.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/14121944306.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/kazenuti.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/mokesu.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613784278349c---94438560554.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/83102737980.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/7099088723.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/49651425537.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/13878665561.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/87457023577.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/81445932536.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/23133735569.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/tamezivebumuma.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631286549.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_off00011fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBF 10364 bytes
SHA-256: c39b5ac5fdb848c5288cfc7631a08f457fea1af71ceba9dac7b6f063cf2926cd
font_01_sfnt_off0001370d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370D 18852 bytes
SHA-256: 441dcde5f88aa05b1667bf503e0df050240073edac3c7d35c76ec850114f301a
font_02_sfnt_off00016806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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