Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf01e85d0c42fc1b…

MALICIOUS

PDF

85.6 KB Created: 2021-09-08 23:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8046f730304b8323eb14064d1fae9575 SHA-1: 52318724a81758ebeca326d2ace707cbe78884a3 SHA-256: bf01e85d0c42fc1b64fb17f1d65afa30513f5d67221c7fde1711b9fbe27a6843
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are likely disposable. The primary purpose appears to be redirecting users through these links, potentially to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613343f35d5a6---foxiligadabevesivelepemup.pdf In PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/kipisuf.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/4850395596.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/63138804781.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/jixezeguwanurefitur.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/lefamumag.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/11170201815.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///20308524600.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/fapetilevivifelizabur.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/82956475579.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/26150873430.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210901195409.pdfIn PDF document text
    • http://linza-market.ru/upload/files/41826675231.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/lalixora.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210905233159.pdfIn PDF document text
    • http://fygl.net/uploads/file/060019376005.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/ruwixis.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/gepetaba.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/29281101133.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/36093530844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=led+smart+tv+32+inch+price+in+pakistanPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AB 21656 bytes
SHA-256: d709cdda48bc5cdd8f2f7a4feec3d4fa02fd31595b36fa6d0c103727f49a28e4
font_01_sfnt_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off000116bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED3 11020 bytes
SHA-256: c1108079d1b4ccf9fce66c06e317bf5378c7fcb4fe84d208cf9dd68c95f1d498

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