Malicious PDF — malware analysis report

Static analysis result for SHA-256 4044e916aa12c2f0…

MALICIOUS

PDF

85.7 KB Created: 2021-03-26 07:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 40e4414e15fe0da59d57f06cfcb842e4 SHA-1: 52e32a14028c78b6ea8d0aab50c5da72673962f3 SHA-256: 4044e916aa12c2f0db2e1571487a97729b56c10e5029ba9a073e9ecc7d209ad7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/123?utm_term=fright+night+2+2013+full+movie PDF link annotation
    • http://wdd13.ru/flag_removal_counselinghr0q5.pdfIn PDF document text
    • http://uspex22.online/gemimobetinasiran1lojb.pdfIn PDF document text
    • http://alphabitx.com/doraemon_movies_in_tamil_dubbed_free_download5y7wc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422382/normal_60570583801bd.pdfIn PDF document text
    • http://maxiteguf.medianewsonline.com/31488868092.pdfIn PDF document text
    • http://sunmarkt.ru/lolesarapvwe1x.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/vehicle_checklist_uk.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/pubosikizedetakolewarejes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446165/normal_6051b5ad5c990.pdfIn PDF document text
    • http://uaregroup.com/865171539766thvt.pdfIn PDF document text
    • http://ladijon.iblogger.org/wazobomisitofetepet.pdfIn PDF document text
    • http://chambreapp.xyz/83924232849rx9bh.pdfIn PDF document text
    • http://aduo5.online/ice_rage_free_download_iphoneg4wsb.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/gepalemapifofuzogid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418185/normal_5fe0ddf1cfc47.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kesobikifa.epizy.com/vizikaxademikigokodejofew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87439f57-d64e-4842-a433-4a5db4b90de1/cuanto_es_2_m_en_centmetros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a74067a6-dd81-4246-a59c-e2360d2c7882/12056915698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9fa46b2-8ee6-49c0-9e11-c3e52a420569/zabavepox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b41e23c4-d28e-424b-ac73-59baedb85f41/what_does_basc_3_measure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d562a5a-78b7-473d-bc0f-432b25396db1/dell_precision_m4800_datenblatt.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_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 5296 bytes
SHA-256: b5f3cf9752430acc87b31f6ac3be64027d427c9468fd80001a02fe38df76c97a
font_01_sfnt_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 10916 bytes
SHA-256: c7153757042cf23b46ab2b7013201f2c0dbeefae615926cae29e7262fb65df37

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