Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e3146e052c6c5f…

MALICIOUS

PDF

74.1 KB Created: 2021-04-20 06:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 804cb19a9aa6d0dcf11e430fc90abf4e SHA-1: 3eeccf7a7680952a345c30b8c1d87e77c8bfe0f6 SHA-256: 63e3146e052c6c5f8afc40e1a3066145626d356c5e102e275422a981424708f3
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 or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

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://ponafet.ru/strik?utm_term=insignia+24+inch+tv+remote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490961/normal_600b1dc68b56d.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/programa_para_pasar_de_a_word_gratis_en_linea.pdfIn PDF document text
    • http://goxopisejeza.22web.org/tamil_to_english_words_list.pdfIn PDF document text
    • http://gazajujana.mygamesonline.org/bible_old_testament_in_telugu.pdfIn PDF document text
    • http://fadewujetenuve.mywebcommunity.org/heidelberg_catechism_question_112.pdfIn PDF document text
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/netodarivasaxix.pdfIn PDF document text
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/1849133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411915/normal_6059461d8715d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464083/normal_5ff3da7b5c20e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tativukowodugox.epizy.com/zufegademiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f6f050-ca42-46f1-a780-9e242260aa90/69070287314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bee36e7-39a9-4766-9bd8-7779a71edc44/toro_weed_wacker_starts_then_dies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee7f6f41-7dde-4ad2-b03a-41ddb60c1ff0/46132928514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f815ece4-1106-40cc-9ba8-cc9e5d482e4c/zamadaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca429388-4a2c-4e94-b1d9-53a1e9cfd53b/3491295882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/355d0981-35e3-4894-a334-3bfc5a21ecf6/autocad_tutorial_in_bengali.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_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 5400 bytes
SHA-256: 56b81f393e30e8d6170463e488f653e28ddfd0aaf8e1d11203026c00247936b7
font_01_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 11148 bytes
SHA-256: 172f1743e0ac06187714bd676ad1b1040ae0f6be782e07fd52d4ac82be65a110

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