Malicious PDF — malware analysis report

Static analysis result for SHA-256 5353792e0af07d19…

MALICIOUS

PDF

86.1 KB Created: 2021-04-07 05:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5bdb89e2a38d34a23e66bac280c71de5 SHA-1: e7b4a56ef72bd7eac2d3cff7169804d4b6fa775c SHA-256: 5353792e0af07d19201771b7ac6da7a74e7fb3a5e4b7057145d5610a7903ef25
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs, many hosted on disposable domains. One of the primary external URIs, https://fokemale.ru/wix?keyword=investigation+33a+frog+dissection+answers, suggests a lure to a potentially malicious site. The PDF structure and embedded links indicate it functions as a link farm, likely to facilitate phishing or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/wix?keyword=investigation+33a+frog+dissection+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388420/normal_602318fedea7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462730/normal_603c3d70ee376.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/free_no_carbs_diet_plan.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/autobiographical_poem.pdfIn PDF document text
    • https://wetogukonitama.weebly.com/uploads/1/3/3/9/133997956/d9b7bbae657.pdfIn PDF document text
    • http://salet.store/cement_production_processmq27z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416305/normal_60379b2053e3a.pdfIn PDF document text
    • http://laura-egorova.ru/43296801129awmgh.pdfIn PDF document text
    • http://tigenule.22web.org/tamoxifen_cyp2d6_guidelines.pdfIn PDF document text
    • https://fetesebi.weebly.com/uploads/1/3/4/8/134896421/dazej-lerezagi.pdfIn PDF document text
    • http://kigimol.iblogger.org/36077555222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_603b7f2071ece.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://latuwukatagowa.epizy.com/free_customer_service_training_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73923d58-9ac7-47e4-8297-4acbb4ff2a1c/how_to_handle_conflict_resolution_in_the_workplace.pdfIn PDF document text
    • http://laxolagodofomug.onlinewebshop.net/toefl_grammar_practice_test_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c95df6ba-93e8-48c5-bbd3-9bbfdfed3cca/black_and_decker_grass_hog_18_volt_battery_charger.pdfIn PDF document text
    • http://deroselewem.epizy.com/wipipi.pdfIn PDF document text
    • http://lozulunadiko.epizy.com/halcones_de_venta_gratis.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/31505697745.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_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 1680 bytes
SHA-256: 9e3ca0b175ec03541efce01f734c3642f1c52ac9c7d11c5c788cb953c7b283d6
font_01_sfnt_off000111a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 5412 bytes
SHA-256: 5ba0620faf89e524a555f4124d7177437cf38a689fdf047c17c115c17a2b6221
font_02_sfnt_off0001243a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243A 10720 bytes
SHA-256: b41916c14aa6fca3abc0d0924fe062a359e35ead7e2578b5b374cbfbfdd618c8