Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6d746aeb1752ba…

MALICIOUS

PDF

72.6 KB Created: 2021-09-28 06:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 858790b35dbda41848516484b727096a SHA-1: 2526f2e040332a4b41e457970f4cb37e544f2456 SHA-256: 5a6d746aeb1752ba5c3d1c2079f5fb25c160f9bf95c04c16e37d5bfe3afde1dc
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with several heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://dominant.name/userfiles/file/vexalizuropufubuwesogode.pdf In PDF document text
    • https://bursakaynak.com/userfiles/file/16009113691.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/24263651346.pdfIn PDF document text
    • https://oasis-travel.ro/files/74132916423.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/117b479a6c6e059f82e23503d13edc0c/20176184465.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/limikafanamiza.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/lekasipiviwupen.pdfIn PDF document text
    • https://ikima.fr/uploads/file/61767206782.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/3108966342.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/xupomizuvagu.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/zokum.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/30503795789.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/10395747545.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/47235873773.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/40755588999.pdfIn PDF document text
    • https://superpart.com/files/gadaxetefonobe.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/lutapegirupisigi.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/51835537469.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/dixiteguj.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/34012845235.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/54595348749.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/xajidifafagibumodinil.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/tefeduzusinumuvopepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=get+non+drop+instagram+followers+for+free+malik+vasidPDF 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_off0000b4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BA 18012 bytes
SHA-256: 2207e4b400d4a6805617972dd59bca7e05f37b603fa9201eb27038a50e8c1168
font_01_sfnt_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 11124 bytes
SHA-256: eed81b78e310cd22b02696bca7f050711b3f914d26bc07f55062439291845a94