Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e4398b5ad68c97…

MALICIOUS

PDF

106.2 KB Created: 2021-03-06 07:49:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 744fedae4d92050ae771d23f023199a1 SHA-1: 357be368fa2124ab024acd9fc787536609688211 SHA-256: b3e4398b5ad68c97c33de911c779fcf5f194e29c0a9c0603123e94effda5bba7
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://lozipotod.ru/strik?utm_term=is+the+witcher+show+based+on+books', is presented as a lure to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://lozipotod.ru/strik?utm_term=is+the+witcher+show+based+on+books PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387410/normal_5fd905be66e4f.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/does_the_navy_have_a_sign_on_bonus.pdfIn PDF document text
    • http://sosed.market/gefagabukufutojigozoxep5jxt7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_600bd3150ec75.pdfIn PDF document text
    • http://vidclips.design/why_wont_my_shark_steamer_workh4bop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365601/normal_5fddb5b035cd9.pdfIn PDF document text
    • http://liko-sneakers.com/jugozibolulgyh75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381105/normal_6007f5046ac8b.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/121484926373fmhx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391340/normal_5fee6cc018452.pdfIn PDF document text
    • http://lesuxofozadize.mygamesonline.org/malovewenixanagutudulesa.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/conflict_resolution_skills_between_couples.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/harga_g_shock_ga_100_cb.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/6bf97141-2ebb-4acd-9fd5-2ba10e75ba06/vizipuxovuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03875994-96ff-4b7c-9543-5e81dbb19fa5/pride_and_prejudice_audiobook_rosamund_pike_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a110d8-9f32-4905-bc18-6b0e9b4326e3/la_biblia_catolica_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa3b7ff-0e99-45d2-8e4d-98d0dfb8f533/54894461391.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/common_american_english_words_used_in_daily_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af135ff2-45dc-4459-b2d7-a667375729d5/how_do_you_make_beef_jerky_in_a_smoker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5633e9b-8f02-427d-9518-941f312368ff/75869532387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5531eed-8c61-4b9f-800f-38a885a0cb7f/sijuwaxanajopeba.pdfIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_0b819133298241209ee71630d7261738.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97137d22-e538-456e-94d0-b75d7b4a2ffe/washington_football_team_score_today.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_2ed01246aaee499993c3abdaf288dedc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/311c1aac-ce7e-45d6-8588-98a36943dfe9/in_what_order_should_i_read_the_warriors_series.pdfIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_9d82b59d3ad041dba4f6e29e566f1056.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_off00015eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBA 5228 bytes
SHA-256: 6a2a2fca1f46f3588cf7558a2058c45463445e1b5249880dd4218a88a76dab15
font_01_sfnt_off0001708b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1708B 14068 bytes
SHA-256: bacb30d452fbff4e4fc086d57a1fa370bf61e786de392d6cfb8b387b70b712de