Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57775c8470e6a4e…

MALICIOUS

PDF

67.9 KB Created: 2021-09-18 12:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 698f6adcbb9b43e2df36577815c7738b SHA-1: e08779c96719c0deec49586d29951368b41a8213 SHA-256: d57775c8470e6a4e1ea48a656d6a5eebe8dd0dba2d4990328a88d4baed0b4e91
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common tactic for phishing or malware delivery, indicated by the PDF_IMAGE_LURE heuristic. It contains numerous external URIs, suggesting it acts as a link farm or redirects to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, likely involving the execution of embedded JavaScript to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=the+devil+made+me+do+it+full+movie+online+free PDF link annotation
    • http://pwmtqatar.net/userfiles/file/ximesutotamaponubewefamo.pdfIn PDF document text
    • https://produse-zilan.ro/files/tefogipoxividozit.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/mowawonotumok.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/fojugeku.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/74497755910.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/sipurogomexerovatugome.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/kifazifovuxosoxatajanaxew.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05484be62---72390666393.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/wotima.pdfIn PDF document text
    • http://airzo.net/userData/board/file/kulun.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/vawuga.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/rijux.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/13078792457.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109160647064100.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431ac1207fc---70168106704.pdfIn PDF document text
    • http://ruihuitax.com/files/file/muwutumufepiv.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/taxolopasezavisapuvu.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/64569013379.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/76421828152.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0904/45037969ef30cff1aa49ebf3fa49e3f0.pdfIn PDF document text
    • http://spbi.cz/res/file/derujobesage.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7812805614.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/lasurumekatulerapinikav.pdfIn PDF document text
    • http://sireny.net/share/files/271954085.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_off0000af1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1E 10580 bytes
SHA-256: 774eb33899e30052106e1a4d2c2fd28ae330a08530ea4176c35c66a74f7224a3
font_01_sfnt_off0000c70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 14056 bytes
SHA-256: f0230b4ce110769a18f78556be16fe37bc58c5b72abba7413e425e64bedd6b82