Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da9f563d387f355…

MALICIOUS

PDF

77.5 KB Created: 2021-02-23 21:24:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a1525c43edfc4acba0772e3f1e732ff6 SHA-1: 551794bad38ccf53668a9ea76a52d638ab4253c7 SHA-256: 6da9f563d387f355db9ca51dda57d87e4432f95fbce1a4f263341bdc172c8d72
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm by heuristics. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary function appearing to be directing users to a multitude of external PDF resources. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest a potential for embedding malicious JavaScript or exploiting PDF vulnerabilities to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jacksth.ru/wix?keyword=auxlms+help+desk PDF link annotation
    • https://sekinejifupom.weebly.com/uploads/1/3/5/3/135350217/monujefinofifag.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/sijopulitepa.pdfIn PDF document text
    • http://alphabitx.com/azulejos_pea_catalogo760fb.pdfIn PDF document text
    • http://tohld.in/mobile_movies_bollywood_3gpxxubo.pdfIn PDF document text
    • https://rudumareta.weebly.com/uploads/1/3/1/8/131871695/lipukavitolimiv.pdfIn PDF document text
    • https://dapapakutuluj.weebly.com/uploads/1/3/1/3/131384169/7368d6047372420.pdfIn PDF document text
    • http://magnitoli-2ekran.site/user_story_and_acceptance_criteria_template53exv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445871/normal_601e95bba1da7.pdfIn PDF document text
    • http://podarokinsta24.online/8889776228112r68.pdfIn PDF document text
    • http://betixisu.22web.org/specialized_allez_2018_size_guide.pdfIn PDF document text
    • https://fakozopaximubod.weebly.com/uploads/1/3/1/4/131453484/xoputabofolabo.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/lixasifasi/80693709441.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/aleks_math_104_final_exam_answers.pdfIn PDF document text
    • http://zusawobikele.rf.gd/how_to_download_adobe_premiere_pro_2020_crack_and_full_version.pdfIn PDF document text
    • http://satanomoxa.rf.gd/3d_animation_maker_apk_free.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 5016 bytes
SHA-256: d54c31a0f8d8d1a29c8c3d7731b26fccf7af59ef4f5466e3c4e37ee17f55cf24
font_01_sfnt_off0001025e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025E 11452 bytes
SHA-256: 925ae4fd82ff09b692e117c20cd812431a73f773f057f0c361f38c1bfce3c8fc

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