Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b485262faf6777…

MALICIOUS

PDF

80.2 KB Created: 2021-02-16 10:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 6d51dbc7d563983b82210a59b46d313c SHA-1: 176292eb84289534681747b59293d5a18d8c2bee SHA-256: 54b485262faf677706109ef3ebfa2ad5d8a6b82573fe0a21a64cc61263e3c4e0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. ClamAV detection and ML classification confirm its malicious nature. The presence of embedded URLs suggests an attempt to deliver malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=what+is+godfather+death+about PDF link annotation
    • https://cdn.sqhk.co/zanivuwiduvo/jagcVgc/43526858965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462093/normal_5fe63e2301735.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/CJebgj0/shooter_lube_negative_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468253/normal_60089b681a45c.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/ghLHrgi/idle_dragon_tycoon_dragon_manager_simulator_download.pdfIn PDF document text
    • http://menesoger.iblogger.org/baby_shark_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415935/normal_600028b410816.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/ayiibXm/break_time_providence_columbia_mo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_6010c564d1b2d.pdfIn PDF document text
    • https://cdn.sqhk.co/rebamomidaw/idifOQz/42299483161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369161/normal_5fd2f9327d32f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_601d239520023.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478670/normal_5ff1f054e0d88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_60177a8adea1f.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
    • http://zalezir.epizy.com/jumbled_words_worksheets_for_class_2.pdfIn PDF document text
    • http://sitiditazowoz.rf.gd/53310181432.pdfIn PDF document text
    • http://dawovizi.epizy.com/free_2nd_grade_book_report_template.pdfIn PDF document text
    • http://zixugawemi.rf.gd/55832164881.pdfIn PDF document text
    • http://fujesotes.epizy.com/responsive_photography_website_templates_free.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_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 5068 bytes
SHA-256: b1457d96d8eca83e4d44bad7cad255b9340abc3d7791165956635cfe8fff797c
font_01_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 10412 bytes
SHA-256: df712842459f98c0df1772e201dd80a1c90713cbcb0d7182eecff27ff31695a0
font_02_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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