Malicious PDF — malware analysis report

Static analysis result for SHA-256 e356487951b0b1a2…

MALICIOUS

PDF

80.4 KB Created: 2021-05-08 19:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3e5ccf1ae9fdcc8b3f324130d5a6600d SHA-1: e2ac11580a5c9c2ecd3f4445d01db870927c5226 SHA-256: e356487951b0b1a297c9e2470e961f9de3db20ca052b1b39e4b70786ae8015b8
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://midufefew.ru/strik?utm_term=what+happens+if+you+take+2+birth+control+pills+in+1+day PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490264/normal_600d43846e95c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467007/normal_6062f3b3704a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501208/normal_5fcc4055a17fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495988/normal_5fddca5a6c59a.pdfIn PDF document text
    • http://jodazok.22web.org/balanced_diet_definition.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/how_long_does_it_take_to_become_a_real_estate_agent_in_qld.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/78155587682.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zutugidod.onlinewebshop.net/codex_argenteus.pdfIn PDF document text
    • http://gemawinikifiv.myartsonline.com/bernoulli_s_theorem_class_11.pdfIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_2fd4b8f040974d47beafbf6994b02107.pdf?index=trueIn PDF document text
    • http://demunoj.epizy.com/viktor_frankl_mans_search_for_meaning_summary_sparknotes.pdfIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_283a9dc1bc0c406bbb7a66f2282a147e.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_4562159ea69f40f599f2a332e3c9a879.pdf?index=trueIn PDF document text
    • http://buwanizun.epizy.com/enterprise_risk_management_assessment_template.pdfIn PDF document text
    • http://ponenasese.epizy.com/rujesuxinule.pdfIn PDF document text
    • https://535f918c-e50e-4760-9dbe-4b22a9cc1357.filesusr.com/ugd/65883d_df731452be8f452d8eaea58e0769347b.pdf?index=trueIn PDF document text
    • http://xowilewegiwo.myartsonline.com/12_verb_tenses_in_english.pdfIn PDF document text
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_120485f97f0e41eaa150c89ede781d24.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_01d0736145944904893bfe11022a9e12.pdf?index=trueIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_19ac40f644ee454082b97d3fdd896998.pdf?index=trueIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_f27dcdc272ca4829a9f9972cf3912628.pdf?index=trueIn PDF document text
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_f0f73636fc3242d6863803efa3a1cf58.pdf?index=trueIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_4b1888531a3a46c4ab821e93692e4b72.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_2f1d6df98c284b21add26b2a4749a9be.pdf?index=trueIn PDF document text
    • http://levolavajoji.epizy.com/tomek.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_d4a3637bb38f4fc2aed82288b932c4bb.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_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 5748 bytes
SHA-256: 61c3dfd6149606aa2c7a67b7e80ef43c9d8a611d7564e8d652e13d59834cebb0
font_01_sfnt_off00010e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 10876 bytes
SHA-256: c2bb817d1a2c41218f6d5a8b146df083484a37d5deed28c131ff6bfeaf8f0bb8