Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bc43c93e4150d9…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 01:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e18130ae6d1398f488958a2f42f4175e SHA-1: 0b53d9d862ae6ac296de052f47775b6fc765c3aa SHA-256: b2bc43c93e4150d989fe5fa27eb5fb84b3e5228903948d8cde6a97e4841535d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF contains numerous links to external domains, suggesting a phishing or link-farming attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites, aiming to trick users into visiting potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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://irlanc.ru/uplcv?utm_term=just+bike+me PDF link annotation
    • http://homokkepek.hu/editor_up/vajovetime.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/ritinixalenexezodor.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/kajojorabowowike.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/70160482329.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/54886121229.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/nozevuketurukibeva.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a54e34f1d27a0a464ca2e421f6930f86/gudodobubedenuzijikepulo.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/99469747879.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/vumowinilazedesutuxu.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/pufoxokukavakek.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/82523412537.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/fitogakanaxobi.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/wasemuxi.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/908a9d185801295071068e6b7cd346ec/mimubiborusixomu.pdfIn PDF document text
    • https://securincasso-online.nl/ckfinder/userfiles/files/kaxopurufi.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/93571634261.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/42623314870.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/refupuzunojuviguta.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/miwavuvuno.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109022110379638.pdfIn PDF document text
    • http://gekon.net/userfiles/file/58032449163.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/wodutufupalerebi.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_off0000af62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF62 10060 bytes
SHA-256: c8ba161c3528207305ef902b281f4e5901fb25b83f798b2b9674eac9fde25984
font_01_sfnt_off0000c5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF3 16748 bytes
SHA-256: 1648ea2a9bcc77c6e0339296e8a28e321f6ff7037bf857840021410a9b957a44

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