Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e09de1600be8305…

MALICIOUS

PDF

68.5 KB Created: 2021-09-17 02:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8755842f1e6016003ba64bc83f85c411 SHA-1: f25a42144245b4eaf9fde6430b0733f869d99c8a SHA-256: 1e09de1600be8305fa81d2ca03816e35311ef98f73b12d76badbb7bc41edac92
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, with a high ML classifier score and ClamAV detection confirming maliciousness. The document body is heavily obfuscated, but the presence of numerous embedded URLs suggests an attempt to redirect the user to malicious sites. No scripts were extracted, but the PDF structure itself is indicative of a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 68 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 http://portalpr-b2b.es/img/user//file/_0271411001631827732.pdf In PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/12147096069.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/51012229833.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/60348156969.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/nokijatawebumup.pdfIn PDF document text
    • http://findacommodity.com/upload/file/38625622935.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kogelo.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/gakidizuliwiwokivoviba.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210908131503.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210902_150028.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210905_220130.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/lelugujufow.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/14488487561359a06c9c86.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/40170360780.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/22702958450.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/jagomuvadosuba.pdfIn PDF document text
    • https://korankertas.com/contents/files/galozugupivizakafobaden.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/69500184732.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/soviwunito.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/pebinu.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/kopuzipuwibeb.pdfIn PDF document text
    • https://rubfila.in/files/file/wolekakadib.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/turatulukukewivefosax.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bf062d135---zogetitawovisovabux.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/bupuvopudov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gta+5+online+freePDF 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_off0000b219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB219 10212 bytes
SHA-256: 5ee79202e215e3c0cee2813fc678f4ce200294000dd47d0158df2713ba05e8f0
font_01_sfnt_off0000c92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 14164 bytes
SHA-256: 66805e72a4bb9b25e282b59fe7ba80a711815adaa7e0daee275b55995ba94aea