Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd158fc8c847b9c…

MALICIOUS

PDF

77.8 KB Created: 2021-04-24 10:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9e8b1271c7ca9d976bd1e2d323976ddf SHA-1: 1e5c9bfb8691db4de1132fbf5535add30b0e0f13 SHA-256: 1fd158fc8c847b9cdfe776846b30e560326c84f54d3893bba6179cb20ad83243
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=brother+mfc+9970cdw+parts+list PDF link annotation
    • https://cdn.sqhk.co/nifodotiriru/cArhdgj/stoney_s_seafood_house_broomes_island.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/gjcigbs/crashlands_2_mod_apk.pdfIn PDF document text
    • https://jojonawizofobu.weebly.com/uploads/1/3/1/4/131438175/e0ff6c4da02560e.pdfIn PDF document text
    • http://tuvivukaroj.mygamesonline.org/55919270117.pdfIn PDF document text
    • https://cdn.sqhk.co/mamidusidozu/WjcJZSJ/simulacra_2_free_download_iphone.pdfIn PDF document text
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/2684596.pdfIn PDF document text
    • https://lefitujeledezov.weebly.com/uploads/1/3/6/0/136028835/bc550302e7f5b.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/the_boundary_element_methods_in_engineering_banerjee.pdfIn PDF document text
    • http://davorivugexawu.sportsontheweb.net/auriculoterapia_ansiedade.pdfIn PDF document text
    • https://fipupoluvov.weebly.com/uploads/1/3/0/7/130775710/b34cdffd08.pdfIn PDF document text
    • https://zugimawaxudal.weebly.com/uploads/1/3/1/4/131410952/7b01d5.pdfIn PDF document text
    • http://meetly.space/wodoguw9ao83.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/41052754300.pdfIn PDF document text
    • https://cdn.sqhk.co/negolura/egnhasN/home_decor_big_wine_glass.pdfIn PDF document text
    • http://silvanozito.online/power_book_of_ghost_season_1_episode_6cbrnr.pdfIn PDF document text
    • https://fapovodulutob.weebly.com/uploads/1/3/4/3/134361236/29154.pdfIn PDF document text
    • https://tivexafo.weebly.com/uploads/1/3/4/3/134348633/9eb888ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_78d022afbb2c4346899de05da3eeb846.pdf?index=trueIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_3a76b009846140f6b850ac482ab46242.pdf?index=trueIn PDF document text
    • http://sipanokule.onlinewebshop.net/my_cousin_rachel_2017_hindi_dubbed_full_movie_download.pdfIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_94e983b4fd3b46d997f45fd4b69d8b6f.pdf?index=trueIn PDF document text
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_0cf9348425fc443dbf7f550200095897.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_ad2bc9f3ad0e4e8396d1f09c6b4f4841.pdf?index=trueIn 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_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 5916 bytes
SHA-256: b69e38c7dbf66b122daf05a3ea303dbb57ec70f22a5b6675867707b4f25d8e9a
font_01_sfnt_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 10360 bytes
SHA-256: 6690df96a58aa544d235c2de272042f9bcc3eee600be08047741c1ec5da9bce6