Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df34b987da4d8ca…

MALICIOUS

PDF

79.1 KB Created: 2021-09-21 00:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a6eedf855b62b1c7f181a9249f2bb2fc SHA-1: d10871ba0391b06fceebbabc3c84de1d94991be8 SHA-256: 1df34b987da4d8cae200f9ba941f2de67df8c5b5e60b11cc432585a33cebf2b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to multiple external sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing or malware distribution techniques.

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 https://garglob.ru/uplcv?utm_term=introduction+to+geometry+solutions+manual+pdf PDF link annotation
    • http://stepasidemedical.ie/images/uploads/file/86973044862.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/99791725200.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/sixowosadux.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/25165336644.pdfIn PDF document text
    • http://dpkwi.org/userfiles/files/57757484190.pdfIn PDF document text
    • https://jurad.eu/files/file/balomidazemux.pdfIn PDF document text
    • http://liily.jp/upload/file/20210903222404.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139dddd3be43---24516052673.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/77436773480.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/68081560836.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/zunazabalikowoxuje.pdfIn PDF document text
    • http://didopack.com/files/83416819921.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/70129559499.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/65265698300.pdfIn PDF document text
    • http://kalikraft.com/images/file/ganuturovenujawa.pdfIn PDF document text
    • https://rippa.pt/files/file/6770807275.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/lisase.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/63717967794.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/87154910984.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/lizanuvedulukubijuso.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/zawogore.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_off0000c669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC669 20784 bytes
SHA-256: 92fd202f5566b65c88d510475b696a241f5e5eaaff40631b6c3b51da40ee8bc7
font_01_sfnt_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 11128 bytes
SHA-256: 0be113c0e801350815d7e6ec743e3d0f0f27d312be029571638e7f5515d5520c

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