Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6b0c315b8b400a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-27 22:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9fc0bb4a1f92910efdbdb58c5928e3e7 SHA-1: 1beb51fa7db6d2bb50469bac8b4a6ac12f873151 SHA-256: 6a6b0c315b8b400a27c764e9b1cfa735a3ca075cefd173969ab104335ff965d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://hart-metale.pl/gimnazjum/userfiles/file/fokijejupigoromejurive.pdf In PDF document text
    • http://bookblog.kr/data/file/files/bamomovusi.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/wapusisurosod.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/gowafi.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/23627049171.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161444a88dc51c---40420470720.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/80027846368.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/64246971645.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/powuzakebisi.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/silotezivisisawuloko.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140d142775cd---93660214413.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/zimagedijajuduzixikot.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/gedazamufujux.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/jikagugop.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/73827104143.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/povoxedexekurisoxavupat.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/23675903692.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/28035182588.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/17311954405.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/salamonobabutokuzego.pdfIn PDF document text
    • http://fruitvita.com/files/files/67037167011.pdfIn PDF document text
    • https://campermagazine.tv/public/file/zudekogexokipitusosize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=redmi+note+9+call+barring+passwordPDF 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_off0000b816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD028 20020 bytes
SHA-256: c0450f690907f09d20d1ebca301a0b9ea95b68f5dfdebb6151fee2dae9267ff5
font_02_sfnt_off0001049a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 11296 bytes
SHA-256: addef3c44133c6e09368e30ca20c48497e42fff32b953aeced0b647d07159cac