Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e613a93411b6e46…

MALICIOUS

PDF

79.3 KB Created: 2021-03-07 01:05:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 12106c879a34a4a6eebdaaeb86875b9b SHA-1: e44de387a8d21926738cef61987d290905a66007 SHA-256: 4e613a93411b6e463be8dcc0256aec904e6fb8ad82f10472152c0206bc7d3e0c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/wix?keyword=jenn+mcallister+book PDF link annotation
    • http://ramuwesitavoz.mywebcommunity.org/34636947240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492593/normal_601f8640e4091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403676/normal_6009ae159168a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465252/normal_600b56ec960e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385424/normal_603033c06ef31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5fd2de46f2827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462036/normal_603b7cc2634c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475564/normal_5fd17367a2eaa.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/why_is_my_samsung_refrigerator_not_freezing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369519/normal_5ffc63f2e3937.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486563/normal_5fdf96111fea8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409405/normal_6037a1d0d80d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462093/normal_5fd9e331b9c8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475852/normal_5ff8d548a9a11.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_8ef7abb26cb84cf38b291fedbe954cdb.pdf?index=trueIn PDF document text
    • http://litorow.myartsonline.com/razor_e200s_scooter.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/timex_clock_radio_with_nature_sounds_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b228d9-ee56-41d1-ad5a-e6789085a2e1/ipad_mini_and_ipad_air_2_size_comparison.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf037c6-4463-4038-a070-a8642efd51ac/30228332624.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_cc9320d944f9473ebfff3f262bd1cf2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3416013c-8d6c-4ec7-87bd-7825080ca530/coachmen_rv_stock_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3221eaa-e27f-42ce-9fd2-90019ced84ef/68332237191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/664ccccb-0ced-45e2-83f5-edac09684006/kaxapupujajikegumuzagat.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 4928 bytes
SHA-256: 91a172840adedc6bb2016888c7ef9fc61f07c0120cb005d7c17cbdd803437d8e
font_01_sfnt_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 10192 bytes
SHA-256: 0e07e0ce8b9ff10a6d50b028b096df48bb3644e3d1bf230f24a70ba6495120e4
font_02_sfnt_off00012139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12139 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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