Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4fde0d8f99e31d…

MALICIOUS

PDF

93.3 KB Created: 2021-02-28 22:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c9a28f494890db303732bfb5cd6b471b SHA-1: 2870180c5ee4e9566404ec6aa9c7c303440a022b SHA-256: 0b4fde0d8f99e31d749995b5cc6f190145022c268aac32b2bb67c54d7519e83f
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute traffic to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment used to redirect users to potentially harmful content.

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
  • 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 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.
  • 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://crophysi.ru/wix?keyword=texas+association+of+realtors+pet+agreement+pdf In PDF document text
    • http://manamuposa.getenjoyment.net/22_what_are_two_examples_of_hybrid_topologies_choose_two.pdfIn PDF document text
    • http://rabizepafuxonag.mypressonline.com/the_long_haul_movie_trailer.pdfIn PDF document text
    • https://mopebewugo.weebly.com/uploads/1/3/0/7/130776026/nesibuxiwifawif.pdfIn PDF document text
    • https://cdn.sqhk.co/lomekojop/LgcjaM5/49373937053.pdfIn PDF document text
    • https://kenojitoxudu.weebly.com/uploads/1/3/1/3/131383977/folufumebejese.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/ja80ghw/best_first_person_shooter_2020_xbox.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/what_is_political_climate_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/zanudiwageg/Ahashjt/nozarijexuxezam.pdfIn PDF document text
    • https://fadurobudafeme.weebly.com/uploads/1/3/5/9/135959894/deworet_wunoduvabo.pdfIn PDF document text
    • https://cdn.sqhk.co/gutipefu/87hhLOF/65198597998.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/mcgraw_hill_connect_customer_service_number.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://s3.amazonaws.com/vosimalume/rpg_platformer_scratch.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/68158502175.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/nuvodabetenoduruwa.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/egyptian_cotton_bath_sheet_sale.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AE 5280 bytes
SHA-256: 2d3fe3c73f157c40a0621fafc5934124893382ef81011e303a59269ffdb23aa5
font_01_sfnt_off00013584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13584 10488 bytes
SHA-256: d64f95636297dd19314c42a0dc5601c3f6ef8167801ce7430e0487b7758ff664
font_02_sfnt_off00015961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15961 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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