Malicious PDF — malware analysis report

Static analysis result for SHA-256 71154a6537433e9a…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 13:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4dbdb67d03e234557293671de8c4c451 SHA-1: e73aac0946216f84bda6d1b9aad971c38dfb0047 SHA-256: 71154a6537433e9a6443730199622aa5bfa35843bf38c2f5550ff882792068c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a209e05a75f---vowikibexobagegi.pdf In PDF document text
    • https://keluargamimpi2.com/contents//files/49919177263.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/52168044546.pdfIn PDF document text
    • http://apicn.net/upload/files/17313768495.pdfIn PDF document text
    • http://nktrading.qa/file/files/85195165181.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/43007098177.pdfIn PDF document text
    • http://teakdeck.pl/files/file/zitate.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/88449459429.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6b42ede98---refilonizuwime.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/58432169321.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/29237698456.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210610080622.pdfIn PDF document text
    • https://laser123.com/geektic/files/3542936833.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/vuvolekufut.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/98446341516.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/23463491299.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/vesumigimojisej.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/14381716981.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/nejunanujumivasirobuzusis.pdfIn PDF document text
    • https://aaaxxion.info/images/file/soluxodagasilakoraz.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a315e83f48802d5025a393bfbcf570a2/12137015307.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/mesorubelalol.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/xibunuzo.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/zimatax.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/jusijenotonuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=colostomy+irrigation+pdfPDF 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_off0000cd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4C 17464 bytes
SHA-256: bb2ec2b41492c674a8d0a370dc8892afe39ced76ff6c279d3dd818a706a72387
font_01_sfnt_off0000f9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C7 10852 bytes
SHA-256: 2914482688eafc1cca024c5dc99670c754e5709fdea8d2dbf1fe0589e198f47c
font_02_sfnt_off000112a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1