Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7dab720b4ed4a2…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 17:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba604f030767835963c678cdbb5d7326 SHA-1: 32ca991938b4e8dbc1fdc65682fbc1db25c61018 SHA-256: bc7dab720b4ed4a251bfb6d07708ce275cc5f4374338366aaf1be8f51ce4e42d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution intent. No scripts were extracted, but the presence of numerous external URIs indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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 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://krisoc.ru/uplcv?utm_term=therefore+at+the+beginning+of+a+sentence PDF link annotation
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/tukixesawik.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/wekoweb.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/26998690216.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/piturezejikunoj.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/98341269713.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/vuvufujidejukute.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/70111522478.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ccc78c41---dewefesagirapenavobumadi.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/61426691109.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/kosedijinuja.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/xusilesifonimosasot.pdfIn PDF document text
    • https://fobh.net/userfiles/files/45584266850.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///faxofitekazojeseg.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/roderefagedatu.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/25008229188.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/fobokigisina.pdfIn PDF document text
    • http://julianina.dk/upload/file/57747886563.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/9545224408.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/lumip.pdfIn PDF document text
    • http://wwstationery.com/files/file/nesabefupefe.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/10003653262.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/fofid.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8F 17912 bytes
SHA-256: c651c9d40b54ec95c559f4d0f9926b8bf39a0f80900a6b973ee4d794b5ca6a89
font_01_sfnt_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001049e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 10672 bytes
SHA-256: 0eb526e434e83feecb54af4e87cdc9f6db5c5cf755a4b184d9a209b07b53f0b4

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