Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf38420703e5b602…

MALICIOUS

PDF

83.7 KB Created: 2021-04-03 16:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 49a20d00ecc8844e2aa960795913af01 SHA-1: e3bd9bd2209fe36c50b1323324e171c8ee178807 SHA-256: cf38420703e5b602f0a256d47b237406cde04e64c733bf338151910742e0832c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated, but the presence of external links and the overall heuristic firings point towards an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/award?keyword=dictionary+of+business+law+pdf PDF link annotation
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/xomifatubivuwa-jovubidozobu.pdfIn PDF document text
    • https://cdn.sqhk.co/zokelofid/bjf51id/juventus_fc_fifa_20.pdfIn PDF document text
    • https://sigiduba.weebly.com/uploads/1/3/1/3/131384121/diwikesobelegebaruzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_600fb4611d2ec.pdfIn PDF document text
    • https://pudibapajupi.weebly.com/uploads/1/3/3/9/133986481/fuviza-nozudi-powederibud-kodeseda.pdfIn PDF document text
    • https://monubigikupo.weebly.com/uploads/1/3/4/4/134493781/a88ce.pdfIn PDF document text
    • http://zesigosaf.22web.org/karl_marx_biography.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_605f696c620f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_60651a6fa5430.pdfIn PDF document text
    • https://notesorujul.weebly.com/uploads/1/3/1/4/131407176/6478164.pdfIn PDF document text
    • http://juvugewit.iblogger.org/4602533445.pdfIn PDF document text
    • https://jironomazubem.weebly.com/uploads/1/3/5/3/135393756/8604953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403565/normal_601758473bf0e.pdfIn PDF document text
    • https://jobuvofuwado.weebly.com/uploads/1/3/1/4/131483112/fozevosifiwonunonaf.pdfIn PDF document text
    • https://witatike.weebly.com/uploads/1/3/2/3/132302928/1258899.pdfIn PDF document text
    • https://cdn.sqhk.co/podoxato/gi8hahj/92425858593.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://malinaliwul.epizy.com/74452302455.pdfIn PDF document text
    • http://gesesasogibigaw.rf.gd/robotic_process_automation_market.pdfIn PDF document text
    • http://jukujomufo.rf.gd/what_is_sense_of_touch.pdfIn PDF document text
    • http://gofeneneju.rf.gd/dugimapowovibamisarunuso.pdfIn PDF document text
    • http://disupenepoka.epizy.com/58356575865.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 5480 bytes
SHA-256: 21eff35f5fc23670bcfcdbbd7ca589db659c4df4e03f5eb3af97d68b15055422
font_01_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 11100 bytes
SHA-256: 663189eb424029ba900327f3d8f8f772fc0f16b9fb3b7f12c8fc38bf2da04c21

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