Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e67373a167fa4f…

MALICIOUS

PDF

81.7 KB Created: 2021-04-28 00:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3907909b2728691b7370019efbc718f9 SHA-1: 52aaae223782999d7d669d016430a164be85a5ec SHA-256: c1e67373a167fa4f15dfb6d3b090f4b8f0a9a00d58729a5a95026d676e874f51
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs are sufficient to classify this as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=modelo+de+minuta+constitucion+de+empresa+sac In PDF document text
    • https://static.s123-cdn-static.com/uploads/4466680/normal_5fce8856a0978.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/dark_sunglasses_for_light_sensitive_eyes.pdfIn PDF document text
    • https://tizomejina.weebly.com/uploads/1/3/3/9/133997236/be93f6b02b.pdfIn PDF document text
    • http://securespot.ru/gamafomitwv4dl.pdfIn PDF document text
    • http://hangookoil.ru/379267399417k3u7.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://pushbiz.fun/cbse_6th_class_maths_textbook_solutions_in_hindi9o964.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483610/normal_600951cab3fac.pdfIn PDF document text
    • http://gewarum.66ghz.com/engineering_drawing_sheet_title_block_dimensions.pdfIn PDF document text
    • https://kenafowipadile.weebly.com/uploads/1/3/1/4/131437871/9243303.pdfIn PDF document text
    • https://bugotenopiziwa.weebly.com/uploads/1/3/0/9/130969298/sovetipukuzekus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470980/normal_60369613c8e7c.pdfIn PDF document text
    • http://creditscoretracking.info/how_to_solve_a_rubix_cube_step_by_step_2x2n5rs5.pdfIn PDF document text
    • https://simisidexibasu.weebly.com/uploads/1/3/4/5/134502995/zavexevizakifamu.pdfIn PDF document text
    • http://bimovixexena.scienceontheweb.net/90492116089.pdfIn PDF document text
    • http://lnstagram-helping.live/79952553030cx2hq.pdfIn PDF document text
    • http://medyahanem.com/21439623844155me.pdfIn PDF document text
    • http://zapitexidij.mypressonline.com/curso_de_economia_fabio_nusdeo.pdfIn PDF document text
    • https://jafofuwozag.weebly.com/uploads/1/3/4/3/134320688/rufawobufavufula.pdfIn PDF document text
    • http://vumavotanumibuv.iblogger.org/fiocco_allegro_sheet_music.pdfIn PDF document text
    • http://spacexfoundation.net/20074045126vp7t2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zovaner.rf.gd/how_to_make_brown_rice_in_hamilton_beach_rice_cooker.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_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 5224 bytes
SHA-256: b884a8fe544e15ca922bd324f1f8fd983ae4562d43f750eda65068ea85796f98
font_01_sfnt_off00011167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11167 11728 bytes
SHA-256: 4fa4b7a92d7880b47aa50cdd3bd607706cc9623cdb233b735d131666d2f71102

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