Malicious PDF — malware analysis report

Static analysis result for SHA-256 627d8dd72dff25aa…

MALICIOUS

PDF

68.0 KB Created: 2020-11-25 07:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2590b5e99084a7fa759d0a27379cd249 SHA-1: 1d94126e283655e494ba60e5764ae2b03a0ec029 SHA-256: 627d8dd72dff25aa2eb245527007a7933f537fee72c8599868c6588aa5dbeaea
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of such links. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of external links suggests an attempt to lead the user to a compromised or malicious resource.

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 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.
  • 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://trafffe.ru/strik?utm_term=history+of+japanese+art+penelope+mason+pdf PDF link annotation
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/3953968.pdfIn PDF document text
    • https://watuwejaxor.weebly.com/uploads/1/3/4/4/134437052/9666862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418584/normal_5f9ad837afa04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5f8f230cce11d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5f95e576741d6.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/439e1b5f-42a4-40b2-a149-29f59f8abd5c/67782631088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b0c159c-3619-4d63-a681-6105a55b6475/73821820342.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/fundamentals_of_building_construction_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ca8377-80ba-416b-ad91-71965f59c9b1/one_piece_histrias_alternativas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c8ff30-1f98-4b54-b8d5-2589624a5112/42775178805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65655da8-244d-474f-850c-5e434486a69d/chartres_cathedral_ap_art_history_go.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/928b48c8-35dc-469d-95c9-4af1f12c43dd/80071688905.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/minions_3_full_movie_123movies_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/bodyguard_malayalam_full_movie_free_2011.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CF 3724 bytes
SHA-256: 64d5775571a1f87c816ecf32ff67fde1a1570efd8e9a87b4b5a493cb59281973
font_01_sfnt_off0000bdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF0 5116 bytes
SHA-256: 11d9d13a4594c61d8a0f139f03ddd7f6aa7864ec40675f710f724274eda89e91
font_02_sfnt_off0000cf42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF42 10424 bytes
SHA-256: 7e13188c95fe3b4bab34b1db9d03f8e89056f1920b47701c7cb47802f4ea3d28
font_03_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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