Malicious PDF — malware analysis report

Static analysis result for SHA-256 38dcee5437981543…

MALICIOUS

PDF

75.6 KB Created: 2021-02-24 04:52:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6912fbf875e712ba232f32cd5d9a6b28 SHA-1: a7a075e7e413b58d0ddc44afc8807dd7ef7fcdb2 SHA-256: 38dcee54379815437a2b8aafc32587087d58cfa287bcb840c59d3e887ce058b1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wix?keyword=up+all+night+lyrics+beck PDF link annotation
    • http://kapusta.pro/how_do_you_use_formative_assessments_in_the_classroomdpven.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/843189002975sv6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388611/normal_602e14c9bf3a1.pdfIn PDF document text
    • http://13millions.store/buvetujo3girq.pdfIn PDF document text
    • http://tiwelonepozafuw.iblogger.org/febugepiwumalibi.pdfIn PDF document text
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/bokavedokof_fivogadu_gerax_xiwebux.pdfIn PDF document text
    • http://titanovyi-filtr.ru/lidinomeyl4aw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_6025c65c8986a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_6034f553de523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494868/normal_600ae67250898.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://wazilopuwifelig.epizy.com/when_you_dont_know_what_you_did_wrong_quotes.pdfIn PDF document text
    • http://wajutomagavugaz.epizy.com/ggbs_concrete_mix_design.pdfIn PDF document text
    • http://sujekafejawojav.rf.gd/87674636503.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/confidentiality_notice_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/352927154.pdfIn PDF document text
    • http://sabozet.epizy.com/how_to_conduct_an_investigation_meeting.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_off0000ddba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBA 5172 bytes
SHA-256: 7d9b37b1a7ca8cdbee177cfa31578b62a428d2ef4c58c766c32882087c369715
font_01_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 10588 bytes
SHA-256: 485b9a9892007d1676ed8aec85064f3ab8ede4464fa13cb28ff2ac9c56c17c47
font_02_sfnt_off0001136e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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