Malicious PDF — malware analysis report

Static analysis result for SHA-256 b102887ca02f16c9…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 00:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b81dd3939be942621cde39212844fd58 SHA-1: 897b514d0d9ee7c3beb8d9b182769058b2e5f521 SHA-256: b102887ca02f16c9e7698bd8b57b22109010242d884705fd41dd9d18f4506f4d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to potentially disposable domains, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://goooinggroup.com/userfiles/files/20210910_211127.pdf In PDF document text
    • http://zuche0551.com/upload/file/16890912490.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/dexesupawopifuwimogogesi.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/44357290262.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137673259b17---60163116075.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/56013095918.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/87749843062.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/gitefipadom.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/46209923295.pdfIn PDF document text
    • http://szm.hu/userfiles/file/jomafogujemovitakude.pdfIn PDF document text
    • https://medius.sk/userfiles/file/81530594585.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/bevobakererimaz.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/gifudefof.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/47009663170.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/mobumudaxuwufamot.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/95190139352.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/3700611106.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/94535107737.pdfIn PDF document text
    • https://autoskola-scp.com/files/vobazexewifepikevite.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/44278524721.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/dozosalabimabovugubov.pdfIn PDF document text
    • https://petikdaun.com/contents/files/10971516579.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/nomujutumilivevasimatana.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/96832813054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=epsxe+for+android+gamesPDF 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_off0000b027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB027 10784 bytes
SHA-256: 7936bb9266b9a93d01b5fcfa9605209f7c2924e20589a4e497c03bc2847cb0c1
font_01_sfnt_off0000c8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BA 16352 bytes
SHA-256: 8d435c21c32a9f96123301df0ec6bb3ec03c653f3c2c1f980de01a754b0c2de4
font_02_sfnt_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1