Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bd6d0223db0434…

MALICIOUS

PDF

77.4 KB Created: 2021-03-21 11:00:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 95d256843db2276ccf66fdfb2faf68f6 SHA-1: e10f047674c2467501e835a008f2ce879dce50e2 SHA-256: b2bd6d0223db04341633194e17784fa3f9b5a2b0d2495d92b6b6226757ffc18d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/123?utm_term=beginner+spanish+vocabulary+worksheets PDF link annotation
    • https://cdn.sqhk.co/tufuboloruj/3igjjIc/19816528248.pdfIn PDF document text
    • http://intekzafast.online/11341307053ul49a.pdfIn PDF document text
    • https://cdn.sqhk.co/vikaxokaso/giewOhb/groupon_payments_merchant_user_agreement.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/aILTMrf/disomebus.pdfIn PDF document text
    • https://cdn.sqhk.co/sibamoxa/b0hhUja/reserveamerica_camping_app.pdfIn PDF document text
    • http://pixell.store/livery_bimasena_sdd_pnglg2fm.pdfIn PDF document text
    • http://gasolotiravizid.sportsontheweb.net/64039898167.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530070/normal_5fecbe6f38a8b.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/67867907710.pdfIn PDF document text
    • https://cdn.sqhk.co/jojevirelo/0JicjcZ/best_6_heroes_in_castle_clash_2020.pdfIn PDF document text
    • http://pazolozul.mypressonline.com/guvoxofozogimajowubig.pdfIn PDF document text
    • http://rumepado.mypressonline.com/what_animal_is_akela_in_the_jungle_book.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/nMhbAky/74324214445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_601745bd014b2.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://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_55812ef0c7b34d6986c82cdec1baea39.pdf?index=trueIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_0feea72dff884db180c8a79e80ead148.pdf?index=trueIn 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_off0000e2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 5584 bytes
SHA-256: be2566bd0fe006c31e19566dafb9ef7ecd4c8eed56ff51b4000fa4e028f75104
font_01_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 11068 bytes
SHA-256: 321a1a5fd778df0e77d8b87b88bbae4d0752f45d0eb7fa1cf66cd1b8d1ac8988
font_02_sfnt_off00011a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A69 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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