Malicious PDF — malware analysis report

Static analysis result for SHA-256 1329c1ced776e4ac…

MALICIOUS

PDF

90.6 KB Created: 2021-04-06 03:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 87ab9091cdc8f8a5514aa14640e0a93b SHA-1: 9097c4b669febe78679ab206604bc208e762d2fe SHA-256: 1329c1ced776e4ac27d61c16624aa3f5c092cc7f46a9b516e264ecab8d0063ae
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a password-protected archive lure. It also functions as a link farm, pointing to multiple external URLs, including one that appears to be a direct download of a PDF. The presence of embedded URLs and the overall structure suggest an attempt to trick users into downloading further malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dafemum.ru/wix?keyword=bootstrap+file+upload+style PDF link annotation
    • http://vuzuwul.getenjoyment.net/gerif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502464/normal_60383ae3bd112.pdfIn PDF document text
    • http://fionainthefield.org/eight_limbs_of_ashtanga_yoga_by_patanjalidle8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502188/normal_601ed67bea690.pdfIn PDF document text
    • https://cdn.sqhk.co/velomegu/fVgfDgj/teribatonamaseweweg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_5fd79163eb43e.pdfIn PDF document text
    • http://zajilakofudo.scienceontheweb.net/gikalo.pdfIn PDF document text
    • https://cdn.sqhk.co/kogoruzojif/hjagjii/war_dragons_forum_breeding.pdfIn PDF document text
    • http://uabiomanix.xyz/sufalewujomarokapw9j3.pdfIn PDF document text
    • http://arendagg.xyz/best_portable_water_flosser_ukp9tqh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_9d57c0bac5744434b545adf6dd2ec56c.pdf?index=trueIn PDF document text
    • http://xemigososefof.atwebpages.com/40166246431.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/casio_rangeman_gw9400_review.pdfIn PDF document text
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_39d0363cfc0d4f38aac29694504eb091.pdf?index=trueIn PDF document text
    • http://jewofeket.onlinewebshop.net/83280163973.pdfIn PDF document text
    • http://rirokisigutu.rf.gd/29032268544.pdfIn PDF document text
    • http://gafibis.epizy.com/what_does_contemplate_mean_synonym.pdfIn PDF document text
    • https://74df6fe0-557b-4e47-8461-f2df536053d0.filesusr.com/ugd/4dcf4e_b993091344164df995c29294a92ae1dd.pdf?index=trueIn PDF document text
    • http://fodixox.rf.gd/million_dreams_piano_sheet_music.pdfIn PDF document text
    • https://81d89a68-18ac-4cf1-ad00-ddd5d2f7da41.filesusr.com/ugd/ed58ef_86f7b50599e24b3fa7ecfcf68ecca158.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_off000120bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BD 5188 bytes
SHA-256: 139479e95226429f9e9799c4a4fe2f77ba93bdae41dbf1e55f04f46b948d8645
font_01_sfnt_off0001327f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327F 12624 bytes
SHA-256: 67181ee8222b8cc8476f3a1a314e5c8e96384bfe7f9be0f75249382e40e4f6e1

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