Malicious PDF — malware analysis report

Static analysis result for SHA-256 93aa489a599d0f2e…

MALICIOUS

PDF

70.0 KB Created: 2021-04-15 13:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: da609194baf08aa9d528ff67ca17f785 SHA-1: 3cb6544248aa98d193f31667fe80bd6f4828c8e9 SHA-256: 93aa489a599d0f2e79a784746963d659a890c0778e4c0779b273eec7665d0eab
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=contemporary+cultural+diffusion+ap+human+geography PDF link annotation
    • https://cdn.sqhk.co/numiwufeguv/jegjhh5/4464793913.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384296/normal_5ff8c32024b65.pdfIn PDF document text
    • https://cdn.sqhk.co/giripiponi/MDAigjc/marco_s_pizza_locations_toledo_ohio.pdfIn PDF document text
    • http://jerugujekema.getenjoyment.net/36205747560.pdfIn PDF document text
    • http://vopagokiniki.mypressonline.com/vugapokusetixuta.pdfIn PDF document text
    • http://gifagudilul.mypressonline.com/baptism_in_the_bible.pdfIn PDF document text
    • http://nokirixako.iblogger.org/famofizila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_600ef002cb208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5fd1b18dbf3d7.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/Bhejb9O/11671828524.pdfIn PDF document text
    • http://fiwuserav.22web.org/hackers_toefl_actual_test_writing.pdfIn PDF document text
    • http://ratixopawem.mypressonline.com/45503092589.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wunekoxewufomaf.epizy.com/24958659822.pdfIn PDF document text
    • http://kebawobokatole.rf.gd/how_to_make_book_in_illustrator.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/37449629527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69cd60a8-bbad-4982-9e34-d52d3ebb6766/what_is_screening_method.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/visikome.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/70847364711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca7d44f-c2b9-42d8-bc28-e084ea740cfc/fender_mustang_gt_100_amp_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/paradise_fire_news_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a33886b8-b704-4510-87d9-2e08c5634e3a/which_breed_of_dog_is_easier_to_train.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1628f151-a07b-43f3-aa7b-71f79787eee8/what_is_fire_in_beer_pong.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_off0000c9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F2 5576 bytes
SHA-256: 48914a79edbb52c43083adf77406d03cb084d085e4577bdaac2298674326532d
font_01_sfnt_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 1912 bytes
SHA-256: 10b43ecc1c080f527ac22fdad5379ea777f1378f0a8be64d5544c0624bd7b04b
font_02_sfnt_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 9936 bytes
SHA-256: 6bb597375a15475d0bc3f62946485b6670d8b02382b939df1f7205eabded9078

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