Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b90347d34f85803…

MALICIOUS

PDF

83.5 KB Created: 2021-10-14 12:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cd8f8dd5ef6591753b16ce0ac890f972 SHA-1: 2fb4c921c9f2319702ef031de8f2d3bfeed78c2a SHA-256: 1b90347d34f8580336c57dbb0622aa18d24ca5c5bd30acba768ac196a202c3b5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains, a common tactic for phishing and malware distribution. The heuristic 'PDF_RANDOM_URL_LINK' specifically flags a link to 'http://ambulatorioveterinarioscapindandrea.it/userfiles/files/72134276934.pdf', indicating a malicious intent to redirect the user. The ML classifier and ClamAV detection further confirm the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/zemetetefesomurofamaxede.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/61d056774bd4919ccb27475e478ca302/zagefizif.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c06c82e02c---48422706330.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///71075718791.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/20955877937.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/66460486877.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/nekazadedejij.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/85143807913.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/49210523358.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/4096954533.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/72134276934.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/2502338907.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/73894718041.pdfIn PDF document text
    • https://sapporopools.com/contents/files/luvelenofuvifemizux.pdfIn PDF document text
    • http://vinmexindia.com/uploads/navadipebukapuja.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/fupazaxonifipofopanu.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/9323703097.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/13839632334.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/10761081108.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/53791509974.pdfIn PDF document text
    • http://prestopc.it/upload/file/luxilaxom.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/rososejag.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/74405502506.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=federal+data+protection+act+germanyPDF 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_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 17884 bytes
SHA-256: 2031f64ee6f95e073bfe385db086f68d44a3d623571e9b0b4528462a09ff5612
font_02_sfnt_off000127ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AE 10780 bytes
SHA-256: 78861bd0b058a703baf7628d701561001641ac834bd26f0d2dfb0bae5a28ff43