Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b6513cd4f0bf2f…

MALICIOUS

PDF

82.7 KB Created: 2021-04-28 19:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ca4cc6a88f4b61d16b29b5366e81159 SHA-1: b90d84d69f0fa187d459094f17af69b4f1f60a8e SHA-256: 34b6513cd4f0bf2f33aa6bb92fc8da6634b87135eb71924235de8638ac94282c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to exploit users through redirection, likely to a phishing page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=amazon+web+services+tutorialspoint
    • https://cdn-cms.f-static.net/uploads/4413375/normal_606d1598af530.pdf
    • http://kavoxujeledi.iblogger.org/2192095271.pdf
    • https://static.s123-cdn-static.com/uploads/4454172/normal_5fc59a6b70d2b.pdf
    • https://cdn-cms.f-static.net/uploads/4381098/normal_60456f7f16df6.pdf
    • https://cdn-cms.f-static.net/uploads/4485010/normal_602b33f52b107.pdf
    • https://cdn-cms.f-static.net/uploads/4367273/normal_600eecb05a587.pdf
    • https://cdn-cms.f-static.net/uploads/4447631/normal_6068efa9c1768.pdf
    • https://cdn-cms.f-static.net/uploads/4404512/normal_603f50c922f8b.pdf
    • https://cdn-cms.f-static.net/uploads/4423148/normal_602fba979f725.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gajedimigifupet.epizy.com/hindu_baby_girl_names_with_meaning_download.pdf
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_137f21bfba8b4df8b64731a17c91b2f1.pdf?index=true
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_88c8715b36b243ba8aceeace50879374.pdf?index=true
    • https://s3.amazonaws.com/mejados/touch_lock_touch_blocker_apk.pdf
    • https://s3.amazonaws.com/suzujewa/synonyms_exercises_b2.pdf
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_eabb70a720964197b565b5213f5cdc88.pdf?index=true
    • http://jerofob.epizy.com/17635329938.pdf
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_682702d024524ff3a2fac967a8cd38d9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c5173c43-5e4e-471b-b749-753e17d71170/6.0_powerstroke_manual_swap.pdf
    • https://uploads.strikinglycdn.com/files/0fd140d8-6aa7-4804-aaa9-0c85288d0b76/55300055055.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102ef.bin
16390f6deaaede79fcd7d6a6463958350f2065c7f41a28bcf4d2b0dc30dd1430		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102EF 5408 bytes
font_01_sfnt_off00011555.bin
bc6425d74d33b13e2b620f579068289b17750820cbbfa0c5c7d0eb9b29915dc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11555 11328 bytes

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