Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba85dda2e94b2cbf…

MALICIOUS

PDF

83.7 KB Created: 2021-03-26 07:24:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 629cfb8ee3fedf98529c423f59de2333 SHA-1: e96cb99436faf37dd474eef8146baaeed5622163 SHA-256: ba85dda2e94b2cbfd5552533797dd6c829b29b0ab1f24eeda214477fc03c88fc
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to English grammar and Gujarati language, likely a lure to attract unsuspecting users.

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://dugedepap.ru/strik?utm_term=english+grammar+tenses+in+gujarati+language+pdf PDF link annotation
    • https://cdn.sqhk.co/munuluxel/bqOkhi8/kivix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530323/normal_5fc832f9e8211.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390383/normal_5fe50e437c946.pdfIn PDF document text
    • https://cdn.sqhk.co/sojuzafu/gm1TtWY/25678934686.pdfIn PDF document text
    • https://cdn.sqhk.co/xidizizo/p5wDOi1/availability_form_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499972/normal_6052a5f357a30.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/bghSGJn/seneke.pdfIn PDF document text
    • http://xonejalevesezom.sportsontheweb.net/62782118796.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380383/normal_5ff614bd66368.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/pestel_analysis_of_egypt_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/aYgiNjN/rolling_stones_t_shirt.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://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_61b6b95e0ef941c79558c65c991b8a2c.pdf?index=trueIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_23ba4d68bdb045259a4680ff7a0f7a38.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_6b85f7638b174e2fa8705f465201a039.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_45e7bf2728bf4963896e87432a81e37f.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_f5c01a0576b445d7b52e1f335cd028c6.pdf?index=trueIn PDF document text
    • http://gafodix.myartsonline.com/lapolodolulejuk.pdfIn PDF document text
    • https://e8802323-0824-40c5-8a58-19d700e27586.filesusr.com/ugd/50cafd_313233d0aac04708a7697cf521c1835b.pdf?index=trueIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_f1be977af5084f9991592dba494805eb.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_b63fd692a5f84568b1878cdf40f5ce04.pdf?index=trueIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_0db569aaaad341b4a795ebc21ad36743.pdf?index=trueIn PDF document text
    • http://bemuvarewu.onlinewebshop.net/agricultural_biochemistry_book.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_30943e6395c04a2489ef413b442f1bdc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 5260 bytes
SHA-256: 0d59e51b49da2d4835c8095b8c9e36fcc18e1719f4d7156b6ccf0716ccec0903
font_01_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 10828 bytes
SHA-256: b51264a1a702227f98104e527cd3942ad1454c9394b715c3e310492711b989a9
font_02_sfnt_off000132d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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