Malicious PDF — malware analysis report

Static analysis result for SHA-256 495cfa5833c259d7…

MALICIOUS

PDF

86.9 KB Created: 2021-06-14 23:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e8d83ee299cce82760723321b83b4e8f SHA-1: 56a732103c8c6981ca4f61f3f0adb2166b24dd33 SHA-256: 495cfa5833c259d741962f003485fe4389ce12dc9d0ac53e76524f3d670fbd90
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://drafthe.ru/pbw?utm_term=new+year+shayari+image+download PDF link annotation
    • https://miwidikanizi.weebly.com/uploads/1/3/4/0/134016908/xebiset_bedazotewas.pdfIn PDF document text
    • https://musevurimimurom.weebly.com/uploads/1/3/4/7/134711136/5354420.pdfIn PDF document text
    • https://koxamuru.weebly.com/uploads/1/3/4/8/134890845/40f0105b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_60c37d8dd7daf.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4468534/normal_60b6332654c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469145/normal_60280edeae7ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427828/normal_5ff3b5ac8e811.pdfIn PDF document text
    • https://podosutopo.weebly.com/uploads/1/3/4/5/134590637/1218450.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424682/normal_5feba8ef92925.pdfIn PDF document text
    • https://xonedanafesiliw.weebly.com/uploads/1/3/4/6/134633415/f3251.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144920865/36785424092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c9880d6-1609-4b48-a40e-5ed1c4a0401e/how_to_draw_a_rose_plant_step_by_step.pdfIn PDF document text
    • http://vobaranizume.pbworks.com/w/file/fetch/145071519/independent_and_dependent_variable_in_practical_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/370db77e-99c4-42d9-b73e-c7fa9598826d/semujurax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98af74e1-c8cb-4355-8eb3-6ed559477440/69373664550.pdfIn PDF document text
    • http://ditawulajobu.pbworks.com/f/wujuguwajitidixomerukegod.pdfIn PDF document text
    • http://nukuxim.pbworks.com/f/dagolunuriluxozexiruk.pdfIn PDF document text
    • http://beratirupo.pbworks.com/f/calidad_productividad_y_competitividad_deming_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e905bb9-917f-490e-9e24-12ff4140acc5/26387673566.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 5404 bytes
SHA-256: 8fc3ae9356493264681ece8f5aab824c9f09041ff8980f18d1415ccbd7ef1c06
font_01_sfnt_off0000fb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off00010665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 10200 bytes
SHA-256: 6a53f18418df9608a6a5f22a35f5b2c2e5acb8f5e3e291f114b1ccac58b1ec20
font_03_sfnt_off00012990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12990 12036 bytes
SHA-256: 48c19f3ede6a40273b394bfb97cc8df0cfb3ae311bc1210647834a0328fef15c

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