Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ddb79d91689f11a…

MALICIOUS

PDF

74.7 KB Created: 2021-03-07 04:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8dae79c92e4e797adb3a993a8d62913b SHA-1: 18052ea0ce4f6958a5b81ba13017eb81d96672fe SHA-256: 3ddb79d91689f11a0b213a53faf5fac717dec03b4dc46aa670a2cf79c8ebfab7
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://nipisod.ru/123?utm_term=amplifier+sony+xplod+1200w+xm+2200gtx+precio PDF link annotation
    • http://parralax.net/sawobosozumikepapyeyx0.pdfIn PDF document text
    • http://magnetfix.store/balcony_scene_romeo_and_juliet_sheet_music997eb.pdfIn PDF document text
    • https://dejokorakas.weebly.com/uploads/1/3/1/3/131379117/bosuz-pamipuzanix-gebepivimazedan-sutepobuvawut.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/fad20cd7107a.pdfIn PDF document text
    • https://nafoxowozuvika.weebly.com/uploads/1/3/1/3/131383754/6285407.pdfIn PDF document text
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/moreduwoz.pdfIn PDF document text
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/riganiralimapeji.pdfIn PDF document text
    • https://bexokafosirur.weebly.com/uploads/1/3/2/6/132695536/89dc645b7.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://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_eff5e33f8c66475091afedd176b7899c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26033688-7819-4eb6-be24-1fe4db76e6a8/how_many_calories_are_in_glazed_munchkins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/729c15ce-a7d3-4241-9d5b-bcb446c1a76a/20565147603.pdfIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_a5a9b184d39345edaae9f171af19cee7.pdf?index=trueIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_ecfd47629fad44c6868b330d46e630d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/bandeya_video_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/33267756512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1107cf9-92b1-47ec-884d-c0f0e18a584e/podujodaserapudimig.pdfIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_70809e759ef34972a15491b4c19232ed.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 5628 bytes
SHA-256: 5db75269e0347c473242d00caa0069c7a672fdde6e196c3bef8d121e494005d5
font_01_sfnt_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 11692 bytes
SHA-256: 93adbb39398de49454d15c5b7abb65b198b911f2c684a36268e84c5be963f5ce
font_02_sfnt_off00010d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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