Malicious PDF — malware analysis report

Static analysis result for SHA-256 6abaccd3c43c3b5b…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 05:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ec19fc80a446aca0b94f08d56dfa2135 SHA-1: ed7584aae6762dae46a8c69cc37c3914ba962d97 SHA-256: 6abaccd3c43c3b5b8a989834108f9db7411a16981ea2078cd14e867d9b1d0ec4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and configured as link farms, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://drafthe.ru/uplcv?utm_term=anger+of+stick+5+with+cheat PDF link annotation
    • http://baoveantam.org/upload/files/xusur.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/gotopanudepofew.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/2knja0avp4le2bv58pndg89298/95564281175.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/zogutad.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/nunupigazogima.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/gonodokedu.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/53765580958.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/fetoxewomolunekof.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/5760356915.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/sumunibizoru.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/welisufo.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/sidutibegavulokopoxunej.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/b8e9125733f1b5ddccf2d2c82e4db253.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/jekevenel.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/74386884944.pdfIn PDF document text
    • http://modern-pro.ru/files/file/58388054848.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/96115292421.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/92421679799.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/nolefivemabapedoxanavim.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/57379025063.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/64091647922.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_off0000ab59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB59 10864 bytes
SHA-256: 1d9a86a94d884a122905bec3a87dd0d483eef013a774273c813d89f9aad145f8
font_01_sfnt_off0000c498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 14996 bytes
SHA-256: a181db6ada1b2ea53a22f9c731e2d45b0ca1114c7fbcda3501d8491841a03089

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