Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d5cda35b8a4180…

MALICIOUS

PDF

68.4 KB Created: 2021-03-09 00:54:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 29091856348b320ff88b4f91e1000721 SHA-1: 332d370f3a16a7b5aa93baab1c773cf88b5c5f05 SHA-256: d1d5cda35b8a41809ca385dd49cc1f4c3aa09f6799bec29e6995df6269d7c45b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for a phishing trojan. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The embedded URLs and the document's apparent purpose of directing users to external sites indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=bedhead+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4463824/normal_5fee8cbe45e9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485172/normal_5fcce40fad2eb.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/ffXvlyr/sotexoboziwobozalumigubu.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/e3ggxxV/juvaw.pdfIn PDF document text
    • http://umdtheatre.ru/bomba_de_agua_sumergible_tipo_bala_truper5l1yu.pdfIn PDF document text
    • http://prizinsta365.website/12405675572q3i7u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491965/normal_5fc8ddf31fff8.pdfIn PDF document text
    • http://goproits.com/error_hp_officejet_pro_8610nn0ti.pdfIn PDF document text
    • http://cybety.xyz/finaderovumaneruvepobopof87nm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_5fd662188f8cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_9c3f180c69374d34a6216632fdb4dd8a.pdf?index=trueIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_4905995dfabd4712b4ccfbacf3676d39.pdf?index=trueIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_435eec7b3a0c4f3bb928c2d0f7382de6.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_236510aa44e64a87b9ee760115f90061.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/masonite_sheets_white.pdfIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_483b793a16a84bfeac4a31de88bc43e8.pdf?index=trueIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_779aac5751c44b1eab13e9dadf06eeda.pdf?index=trueIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_7215279631324723bd48a43c5c4fbfee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/idsa_cap_guidelines_2019_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/minecraft_free_pc_windows_8._1.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_off0000cedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDD 5076 bytes
SHA-256: 936339bff2b89f1d52916e861c66cbb1ff1c2ca3203a2c030bcf5d547be1a17f
font_01_sfnt_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 10536 bytes
SHA-256: 53fdfd44da39723f3fa800557bfe6b1b96701fcde0117710ef06f4485f705a20

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