Malicious PDF — malware analysis report

Static analysis result for SHA-256 f761eaec83ee8cca…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 04:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a991a907ac6685a322fcca59cdbfb9d7 SHA-1: 1c07ff8a66943f73e38168c1d7d6a3ec0f4bfd03 SHA-256: f761eaec83ee8cca64edf9eedcc0ea03e0c0c3007243e46e1d505d26cd706986
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which point to disposable hosting or link farms, indicating a likely phishing or malware distribution scheme. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=live+cricket+streaming+on+android+tablet PDF link annotation
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/gizubeguxevak.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/lubafeniripasoz.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/88032483484.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/72094522481.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/12194662812.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/xaxinaraluwidabofepuzojo.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/51137489413.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/gawotaluda.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210920_6BA6B528F81C87A6.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/87922445636.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/42537400753.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/dovajafuxesikuxaso.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/82185524737.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/843344821f35adc8a554ea5ce53fc839/juvogesapejikep.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/xububexu.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/muzerarosez.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/1524644844.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/85489389094.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/tegumulujomilutudeb.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/50378598098.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/74954336958.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/89024450018.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/kujejepesudig.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/38369561874.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210901202617.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/89929122645.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_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 17512 bytes
SHA-256: 3b8bf086ee5cd4b695374e27718db185bb669bb187d0af69fb472b41f5b34297
font_01_sfnt_off00010f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F63 10968 bytes
SHA-256: cc1352da4bd736309f9f99b2a2a100956ca601481eb04763edfb7ee11a721324
font_02_sfnt_off000128ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1