Malicious PDF — malware analysis report

Static analysis result for SHA-256 538e9e6bf0cf6ac2…

MALICIOUS

PDF

78.7 KB Created: 2021-04-05 04:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5760b56beabba6db93dbce0ef7dccc2b SHA-1: b75eed8ccf7eaf82dc343031ef091a385cc9c9a2 SHA-256: 538e9e6bf0cf6ac235401deb89f929e7779277899275e2a8ef4a3f75723bc9ae
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though partially corrupted, contains keywords related to child eating disorders, likely serving as a lure to attract victims to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/award?keyword=trastornos+alimentarios+en+ni%25C3%25B1os+de+0+a+6+a%25C3%25B1os+pdf PDF link annotation
    • https://xazefobilizap.weebly.com/uploads/1/3/1/3/131384081/xipunes.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/FJI1ijh/93010526768.pdfIn PDF document text
    • https://cdn.sqhk.co/furabafezuse/jbm9hbd/lakers_memorial_for_kobe_bryant.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/pikepisoxe_fobogozo_melowid_jederetukizun.pdfIn PDF document text
    • https://cdn.sqhk.co/fotajoge/iafidjh/jogar_dama_online_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/5jdgc96/77595712595.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/dNia0ih/4292631409.pdfIn PDF document text
    • https://zesijedoroge.weebly.com/uploads/1/3/4/3/134372038/821020.pdfIn PDF document text
    • https://gerulelib.weebly.com/uploads/1/3/0/9/130969354/dopokupa_sumufufedav_likobilefitumuk_tulumugiroka.pdfIn PDF document text
    • http://zonojebiridizo.mywebcommunity.org/learn_python_coding.pdfIn PDF document text
    • https://cdn.sqhk.co/welosezu/ejdM6WK/good_skyblock_servers_ip.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/jM7iiES/64509525833.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/djjjghp/sozafidefupojufaraw.pdfIn PDF document text
    • https://geligafut.weebly.com/uploads/1/3/4/0/134012400/4263707.pdfIn PDF document text
    • https://vitigamonewus.weebly.com/uploads/1/3/1/4/131406732/5824776.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/conformational_analysis_of_substituted_cyclohexane.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/local_breaking_indiana_news.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/tofokepefarewopufukaran.pdfIn PDF document text
    • http://nakeviw.myartsonline.com/caries_risk_assessment_form.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/l_t_infotech_annual_report_2014.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/nespresso_krups_coffee_machine_instructions.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://scripts.sil.org/OFLIn 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_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 5644 bytes
SHA-256: 6b430511d982db01af5917f316daf64084bf323cf09ded6ab4d33180546c23a9
font_01_sfnt_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 10328 bytes
SHA-256: 93a7eb53904ede5eb2a8196512c45771dcee29f681f11bbc3a78e6e373f8fb88
font_02_sfnt_off00011523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11523 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd