Malicious PDF — malware analysis report

Static analysis result for SHA-256 48832dd39c732c53…

MALICIOUS

PDF

82.8 KB Created: 2021-04-09 10:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6189fa0fd8b7d11ff4632d35044599a7 SHA-1: 72db5693ed4931266e1f0e8d33b07c4b38c2d9f4 SHA-256: 48832dd39c732c53ed81155537f277ad584fefffcb3001e2dc81b4408031f9d1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to host malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure and numerous URLs point towards a phishing or content redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://soxebez.ru/strik?utm_term=dbt+skills+training+handouts+and+worksheets+barnes+and+noble PDF link annotation
    • http://ellmax-site.xyz/40365975712jt29q.pdfIn PDF document text
    • http://ideaita.fun/everstart_smart_charger_code_f036v7w9.pdfIn PDF document text
    • http://copyrightproblem.com/sazukrjmha.pdfIn PDF document text
    • http://chambrehub.xyz/converting_metric_units_worksheets81yc6.pdfIn PDF document text
    • http://formblckr1.xyz/xufobat943g.pdfIn PDF document text
    • http://masalev.ru/what_is_the_lowest_income_of_the_top_1_percent2a0zr.pdfIn PDF document text
    • http://topcreditscore.info/conceptual_physics_chapter_9_exercises_answers7jj3o.pdfIn PDF document text
    • http://investmag.org/brio_deluxe_railway_set_manual4l4vn.pdfIn PDF document text
    • http://life-news.tech/wimiwefafed5w5h0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_30270bfece8e4f5fab7a1d7a1a0cf856.pdf?index=trueIn PDF document text
    • http://gazugitub.epizy.com/alayamlo_pravesinchandi_song.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_cb21b879b074443e9eee8b743ae72c5d.pdf?index=trueIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_47c72154beb5490589395048f6fe5f7f.pdf?index=trueIn PDF document text
    • http://pixibirorak.epizy.com/gym_workout_plan_for_beginners.pdfIn PDF document text
    • https://77a5c3e7-429a-4f60-ad30-886abaef4f6e.filesusr.com/ugd/07a1ab_d28f9ecc03bf4345a13e03dc483fc1d2.pdf?index=trueIn PDF document text
    • https://5a11eff3-0c7a-45dd-bb89-060d4d4d2060.filesusr.com/ugd/72216b_8f3ba7bbd9bf4a54a3db3981adb5a484.pdf?index=trueIn PDF document text
    • https://1bc2da55-d9f9-46f5-9d67-b48dc82c85d4.filesusr.com/ugd/957ce7_210965f5237e48149e2021bb1944df82.pdf?index=trueIn PDF document text
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_0bfe16cc0b5f42b69b71fd5b9411140e.pdf?index=trueIn PDF document text
    • http://pulizot.rf.gd/cockroach_life_cycle.pdfIn PDF document text
    • https://a6047d18-b57f-4fdc-88fa-dea7715a8642.filesusr.com/ugd/189347_aab011c7e4ed44929da6f84d13273dcd.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_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 5384 bytes
SHA-256: 9a4bd603a26af209129f3a99ffb7a1c81c1c1c22a8e9b15f0c571ffb8469e88a
font_01_sfnt_off0001190a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190A 10716 bytes
SHA-256: 9a44e45ba6fb8e6647e175c8e04ef77b7229ac1aa0c4e4918705a3c5f2d38c69