Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a39f31200f18f9f…

MALICIOUS

PDF

86.3 KB Created: 2021-09-13 04:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 870496ee8a68bd9a2caba48d867d9f3a SHA-1: e8940141adc8cb1818c1bc63fc6ca3d2b8302ad0 SHA-256: 2a39f31200f18f9f4641a54be78a4efeb670cd1fa97a62c3b1731569e25ba6b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://taeguektour.com/FileData/ckfinder/files/20210902_95B2F1B65B898DA1.pdf In PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1eacf5c5921533cced61879ab0ec02f3/94744978675.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/264358636.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/35721406620.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/ruzujevu.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/rabupugoxojelogijod.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/bibonoletowosabelujo.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/63101215305.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/vuloxomebexavimemo.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/1735668310.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/95411828705.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16138e687919cd---tovenuderijof.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/dujijibi.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/42072042482.pdfIn PDF document text
    • https://goodline.by/userfiles/file/dorukudi.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/1314089542.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/tipelesafanove.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/duwesud.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/pabakujixopufunozox.pdfIn PDF document text
    • http://kahasat.cz/data/file/fusejewukiri.pdfIn PDF document text
    • http://annabarons.lv/files/files/dulapuzazufelidifu.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/2484941233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+hero+academia+season+4PDF 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_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 17872 bytes
SHA-256: 0e38cfb10a0ad73cea5c1efdd895632c164f183d5b936c97359c1ad0c10fa3ac
font_01_sfnt_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 10660 bytes
SHA-256: 0852fed40c52c12b0746545f65c26dbf11255e906fb1ed53d871b0721f07ad0f
font_02_sfnt_off00013366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1