Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a06082cb3c9ce2b…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 08:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d027e4ffac1dc92d6804f3ad41ab3d1e SHA-1: c01e33a7f594018ec189c28d98dd6fd4ec0d2d88 SHA-256: 8a06082cb3c9ce2b6441bf7d28d5e992e42df15eee8d5438799050119cc8d66e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or credential harvesting attempt. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristics strongly indicate malicious intent through link manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=how+to+check+your+screen+time+on+android PDF link annotation
    • https://actor-conseil.com/files/file/xadopeloxizi.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/62012772213.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/jinawizakusasopagopivug.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/kagovibezofavese.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/97585522247.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210923072300.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/gusinaragasulo.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210902164255.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/44710417760.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/77621015267.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/70925647491.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/susaruvuzizi.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/lonanesixokukagegifenom.pdfIn PDF document text
    • http://skisun.it/userfiles/files/36777427320.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/47074481672.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149d7b42cf9e---zufojanidizadudezorobuja.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/gerepuxazimogakow.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vaxaruvafumux.pdfIn PDF document text
    • http://feg.vn/uploads/files/segedekukab.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/9814929253.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/65279294108.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/23186940330.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55062250253.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_off0000b160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC972 14344 bytes
SHA-256: 47c1d107345b2aca9b23a3e6f48d7373c217ab1ea5984d7d3316f686412393d9
font_02_sfnt_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 10972 bytes
SHA-256: fb85e81054996f6a7f454f3447cdc419af9d83942e116ca9dca24babda543ff9