Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d633cefcbca9af2…

MALICIOUS

PDF

85.8 KB Created: 2021-04-26 10:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ba2646021fe1adc83e2a3595a2c5bc7e SHA-1: 2e1f2653fdbdb28003e83d32ce20e2b2d279810d SHA-256: 8d633cefcbca9af242089aba1f446e6a4b4c657ebb0feaa4fc11213b8e4c52bf
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains and link farms, indicating a strong likelihood of phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/strik?utm_term=how+long+do+you+cook+a+turkey+in+a+hamilton+beach+roaster PDF link annotation
    • https://cdn.sqhk.co/bikuloxisage/ePifNCo/tozamupifalonoxejojik.pdfIn PDF document text
    • http://creampiepow.club/61107914412msxk1.pdfIn PDF document text
    • http://1offpark.xyz/why_is_there_no_sound_coming_from_my_subwooferx2bmo.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/wamawojo.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/50635148080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404980/normal_6016fcd8053d6.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/uhaPgjX/fire_alarm_testing_report_format.pdfIn PDF document text
    • https://cdn.sqhk.co/pekobenew/jdjiZjg/21389295900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446399/normal_5ffd6ed440c2d.pdfIn PDF document text
    • https://cdn.sqhk.co/woxekivepi/T1o9gep/connector_line_jumps_in_powerpoint_office_365.pdfIn PDF document text
    • http://bimonetejatoleb.mygamesonline.org/coaxial_cable_types.pdfIn PDF document text
    • http://mscredit.info/cuisinart_dcc-500_reviewsi9v1o.pdfIn PDF document text
    • http://bujenaro.scienceontheweb.net/business_administration_textbooks.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501229/normal_5fcba2925f19c.pdfIn PDF document text
    • http://hookup753.fun/business_analyst_graduate_jobs_melbournezacan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485591/normal_604d079892ed8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501770/normal_5fe9cf711acd6.pdfIn PDF document text
    • http://pay-order.info/wedelazexagezufejiro3j525.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/fv5jg5D/78667051179.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
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_faf3e973eafe49f88bfca4e85632ed75.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_8d0985126b0e4df4971ad20a40651bad.pdf?index=trueIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_2bc4e2da08214b1c8d43f4a26e4bfb28.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 5596 bytes
SHA-256: 0c5335067bc808a52dddf68de109efaaba7ff496e74ef40dbe9fdf41972038f5
font_01_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000112c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 11024 bytes
SHA-256: f40e95c94f890bea9dce9cda6a5e63245b19c59844ec823408ed5578b91f2ffe
font_03_sfnt_off0001384b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34