Malicious PDF — malware analysis report

Static analysis result for SHA-256 1242519fa02629b2…

MALICIOUS

PDF

66.7 KB Created: 2021-09-25 10:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5b5f5d79922b3e1ffc66f57cba6734cb SHA-1: 135ef65d8e0a7f7824a41eccf9e602095071f1c0 SHA-256: 1242519fa02629b2777856403448f3e4cd1f081a7a9795774ed544bd5b6d513f
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 embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The PDF structure and the presence of external links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cructi.ru/uplcv?utm_term=transfer+files+from+android+to+laptop+wireless PDF link annotation
    • http://deltools.com/userfiles/file/sirutetupafo.pdfIn PDF document text
    • http://gestioniarmatoriali.it/9495118328.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/45608123492.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/32854733646.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/dovixofirotitumusowar.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/vafazeterisexurotimanotob.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/sinikofipil.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/laxunijobevojesapego.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/jukufetilodapi.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/7430487348.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6p6ov961e2cdpi9cejpfkpmql3/sezixewizabijirimu.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/dugekufuv.pdfIn PDF document text
    • http://feminella.ro/upload/fck/45310049685.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/37039451400.pdfIn PDF document text
    • http://knipia.com/userfiles/file/zoreporizusipakeg.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/xajexutatog.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_off0000a645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA645 10708 bytes
SHA-256: 6c1176e94cffffcccfc55ed57dd40050c59e004bdef59d54be3173fd88602969
font_01_sfnt_off0000bedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDC 15396 bytes
SHA-256: 6f918f40f41c6f5dbacfeef4e22bca13c1caa05662e726c173626cfb8ff3fad3
font_02_sfnt_off0000e589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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