Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1706fff286953c…

MALICIOUS

PDF

70.9 KB Created: 2021-04-29 00:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a480bbba04114d409a756a2a6674f933 SHA-1: e7d239cbfae960674caa4dc1886fcef58b5656ef SHA-256: 3c1706fff286953c68257eb5d3f6a2fc9cbe9f5178a9a17218db556dce60f8b3
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 pointing to disposable domains, 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 heuristic firings point towards techniques used to redirect users to 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://leonvi.ru/strik?utm_term=beretta+m9a1+holster PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368746/normal_5fc826665b2b6.pdfIn PDF document text
    • http://sun-italy.space/fiji_sun_lamp_reviewar8vk.pdfIn PDF document text
    • http://finansi-7.online/360_performance_appraisal_definitionpakjy.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/bojokiparafibaropa.pdfIn PDF document text
    • http://lifopemavuju.22web.org/what_is_negative_public_relations.pdfIn PDF document text
    • https://kolojadulosa.weebly.com/uploads/1/3/1/3/131397946/1791556.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383322/normal_6001804614bec.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/84501.pdfIn PDF document text
    • https://dofikusoru.weebly.com/uploads/1/3/4/4/134472045/jekorobibajudun.pdfIn PDF document text
    • https://kebiluxo.weebly.com/uploads/1/3/1/4/131455508/2395300.pdfIn PDF document text
    • http://muzoc.xyz/nepoleluct23h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5ad8e26-c01e-4911-b414-1374f9f0fdca/will_there_be_another_sex_and_the_city_movie_3.pdfIn PDF document text
    • https://316b94d8-f1eb-4552-9621-e6dada6029ed.filesusr.com/ugd/4b675a_b1804e6111a146feb457fb5c9381eee5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca073e0-3bc4-423f-b9f7-102c7796d23a/que_significa_el_titulo_rebuilt.pdfIn PDF document text
    • http://lufubapiworozil.epizy.com/bargaining_for_advantage_g_richard_shell.pdfIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_e80d3ea10c4f4aa994a7d5d1540a563c.pdf?index=trueIn PDF document text
    • http://xaxuvep.epizy.com/authorization_letter_format_for_vehicle_use.pdfIn PDF document text
    • http://josodajudiwabo.epizy.com/98054195870.pdfIn PDF document text
    • https://abc5f1b3-ad37-4660-b048-d9bff2240d70.filesusr.com/ugd/a1fb68_dfa78da899f74569a7f769afb65061a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e5044f4-93cc-4844-a313-e30416f6cfc7/how_to_apply_a_credit_memo.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_e9ef92c80d2b41e6ba5fef157eeaae38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aa4dc36-f2d2-4742-94cb-2bd2a50937d1/wf-2630_clean_print_head.pdfIn PDF document text
    • http://zilamefuwata.rf.gd/metarhizium_anisopliae_biocontrol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3726f1dc-3e24-4563-80fe-fdf2dbd50d16/tudipajobujaxal.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_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 5184 bytes
SHA-256: c70c27da5409d06265c562538d5e8839d605a928f25dfdf8ad691a5878b20d8a
font_01_sfnt_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 10804 bytes
SHA-256: ac08c68a9301c2e16b030663ff62cd992506d9cb7b9e746795f7f9dac8cb2751