Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad11c55f08888b9…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 22:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8d5ae1d425f771f356c0a072f67543e0 SHA-1: 00d09527e17c5e7708cb5e9978f3a041549d417b SHA-256: 3ad11c55f08888b9c4dbb9d0a0bf7c1cc199308247fe975f5356912b9109e793
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://crysiq.ru/uplcv?utm_term=polyculture+farming+benefits PDF link annotation
    • https://rh-h1tapi-turbo.com/contents/files/bakaguresiwij.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/89380303908.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/654866203.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/98629247915.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/14497402541.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/kamup.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/26896317335.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/lorijoduvifixegijoxe.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109190915556657.pdfIn PDF document text
    • https://wmu24.ru/media/file/zoxelaxi.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/60218966440.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/jixenugululasegabuvuvikuk.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/78687644153.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/13684322443.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/10981395378.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/muzudepub.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/rizovozofidopovotorug.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161385f807ab47---mexesovoduxako.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/finagewilifoganaxa.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/patodekexenarativ.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/nakotogunawofemeki.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/6625243670.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/pasilo.pdfIn PDF document text
    • http://espace.peinard.fr/include/images/files/tedugu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161406d2c871c2---jogososedek.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/60078763620.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_off0000b11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11B 14876 bytes
SHA-256: fd8c75efd6a8885ae325f14d40859a298820edabd34844f2bc1698b08106da9d
font_01_sfnt_off0000d6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AF 11032 bytes
SHA-256: d05c01d8b1c9381ffc9bfc04a752a5f1872932c512d22de05c64965eff557055
font_02_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1