Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d8fb8b4c632e4d…

MALICIOUS

PDF

85.3 KB Created: 2021-05-19 01:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 63f687b31699599cef1dcfb0f3def655 SHA-1: 53df7f3f0819ff8f8e8b4f76a06a7dae36967544 SHA-256: b9d8fb8b4c632e4dd45aac7a3ba5b0dc925877c6530adde2c2eb730168e1e459
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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/strik?utm_term=what+is+the+conflict+of+shark+attacks+of+1916 PDF link annotation
    • http://ferobuxanax.iblogger.org/cisco_jabber_for_windows_10_free.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/gegizosuwija-sumosumakamag-lofonutu-zufak.pdfIn PDF document text
    • https://jarowuvuvam.weebly.com/uploads/1/3/4/6/134614172/45984f37636.pdfIn PDF document text
    • https://butapakenora.weebly.com/uploads/1/3/1/8/131871909/bikujigapuxiwow_pifixodajobe.pdfIn PDF document text
    • http://kopolebukerone.iblogger.org/53473562655.pdfIn PDF document text
    • http://fapubozapanez.iblogger.org/77249644167.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
    • https://uploads.strikinglycdn.com/files/546c9e16-2250-4d5a-9813-d63edd674293/38187820257.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/98511741357.pdfIn PDF document text
    • http://desuvusemexemob.epizy.com/convertir_200_gramos_de_azucar_a_tazas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d178ca-4f65-40e3-84da-b4010fd3a09e/piwajudazo.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/68692275862.pdfIn PDF document text
    • http://lamuzanumezaw.rf.gd/wirojefaxazubovig.pdfIn PDF document text
    • http://dunoxoxuri.epizy.com/big_sean_songs_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9697ae93-549e-4b17-8eba-a9c4a6c2f4e9/52205324974.pdfIn PDF document text
    • http://finabupotokuko.epizy.com/31970817238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afdb6ab4-7d9e-4ec0-b142-13f9126163de/don_juan_demarco_streaming_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04fbf1e3-ddfd-44e2-a2f0-9bfde705e586/romajanibijubovedodata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aaf4af3-597a-49d2-a086-7d44f5b66e7f/73669489644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ecf068-6fa2-48c8-8270-eed201aab406/the_fire_sermon_traduzione.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_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 5196 bytes
SHA-256: 0f1ea6709f964fa39f42e79e53ce4f30e2bfcfd79db5b3e2edf05a289457c7bd
font_01_sfnt_off000113a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A4 10412 bytes
SHA-256: d8eda444d5bcb0eb146a81595de6e9af503b000f9c5b8becafab22700325ef49
font_02_sfnt_off00013748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13748 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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