Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa5ead9099a48cd…

MALICIOUS

PDF

80.4 KB Created: 2021-04-19 09:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 34082133a050fe187cd2f3045f1a1ac5 SHA-1: a56c0c31ac57f4cae2959c5cae1ade0ad4520592 SHA-256: 5fa5ead9099a48cd796edcd4d4b58030f5b5b0433862e39531be42bb1b49dbb7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a malicious intent to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/strik?utm_term=describe+what+is+meant+by+social+impact PDF link annotation
    • https://cdn.sqhk.co/lojosewude/3jcQ91k/unity_3d_endless_runner_script.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/67907522732.pdfIn PDF document text
    • https://cdn.sqhk.co/sobutexe/bghgy0h/sezogamunuxukumamobara.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/96540118736.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/5gcHWja/air_traffic_controller_pay_rate.pdfIn PDF document text
    • https://cdn.sqhk.co/pimabosi/ezsythc/between_the_lines_nikki_grimes_audiobook.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/cd6fa864-320c-4af4-8cc2-b8b427484594/jawetizexuniwifupavap.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/biresakusuvijos.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/gallery_walk_worksheets_for_middle_school.pdfIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_ae172996fe6b4818a2c36ed12dbdc631.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/negonanopix/engineers_black_book_-_3rd_edition_metric_download.pdfIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_ea2abe502ddb4106a6c3d93bf7ea7ce6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d73fa00-3c6a-4282-a53c-a5a96abfda6a/what_does_application_period_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce8c514-9168-4d17-8cff-7c8cff99d575/a_little_life_audiobook_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9528fd-8856-4209-890e-468acb94eb60/which_is_the_best_bosch_integrated_dishwasher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b4a49f-439c-453d-ae87-0f9d8897123e/how_much_sodium_in_wendys_spicy_nuggets.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/25846417823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f2a0536-fa92-4386-8c88-73db7fcd0aa8/logitech_k800_instructions.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_4ae8975689cb4d8d801e281f7c965a5d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df8af468-6ff2-479d-857a-ccb3525d71bc/what_is_the_most_accurate_bible_translation_jeopardy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a658176d-6c02-492b-8317-82b57676ff2c/64668112664.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/combine_like_terms_video.pdfIn PDF document text
    • https://196cdf53-7a38-4f80-8f5e-3ad65c24f50e.filesusr.com/ugd/e5a593_f4903b3899b7403f96626b7770d15d40.pdf?index=trueIn PDF document text
    • http://wififeju.atwebpages.com/54577318062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a45149-b967-4670-bb2d-241ace1d04c6/66289287111.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_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 5504 bytes
SHA-256: d39131549ab9a30dc7aef49ca3ed3d89efabb9cf41ec6aab69e55c7d786a1c0f
font_01_sfnt_off00010c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 11848 bytes
SHA-256: 41a1d597813c9d2307991c11049a1e96eee58331280c2affbd60d434acc2aee4