Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1315bebede76be3…

MALICIOUS

PDF

90.7 KB Created: 2021-04-05 09:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f4876cd7d0d9b0361bb7a49f787da8cd SHA-1: 3831a6a27ff8329b9bbf3efddbd6668e55a55212 SHA-256: b1315bebede76be3b6f1599539d6f2ccb92002f8224c9e8a39980ad1e220a6ec
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://jumiwimov.ru/wix?keyword=3sk+tv+no+309 PDF link annotation
    • http://mowefopovog.mywebcommunity.org/briggs_and_stratton_500_series_158cc_carburetor_adjustment.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/jhjbgd5/condado_vanderbilt_hotel_to_san_juan_airport.pdfIn PDF document text
    • https://cdn.sqhk.co/matelasoguje/kiacjhD/52374779565.pdfIn PDF document text
    • https://cdn.sqhk.co/laxepinam/3XieijX/foniravafuv.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzirixowev/iGMXiim/lolli_radio_italia_hits.pdfIn PDF document text
    • https://cdn.sqhk.co/vatukaso/iagjjiH/pogadajifiwowi.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/aCgiicT/defender_tower_defence.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/aifgdjj/51417899834.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/fidirewujugigaxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1435a5b-0e11-433d-bf54-8316c6187ebb/how_to_get_through_navy_seal_training.pdfIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_068bdb32d2974978bab81bb64932136f.pdf?index=trueIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_f9e5c95b395a456ba31ee53d02740b85.pdf?index=trueIn PDF document text
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_27117782781343548fefd6dc6585f6dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c802d8-d4dc-4ee7-8351-62700c809265/canon_mx300_printer_cartridges.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/10927176901.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/engineering_structures_author_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/enchanting_guide_tbc_2._4._3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/582a9d47-2237-4d91-9df5-1a9c3a7dca1f/nuwexalepelexiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bc38a55-91c6-4c7e-92fb-28417a06331b/44268945863.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/vemenaxizewazalidenapi.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_off000125d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D2 4832 bytes
SHA-256: e7bd4497d2ac157491b5dedd5e79438625f9cdc574b5068323b18b4ce1efefe4
font_01_sfnt_off00013661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13661 11772 bytes
SHA-256: bdc6dc242ada45273e50d978b9e2e84491855cc0e88f1ad8c6e6805a1a19dd5a

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