Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e90676f00c792f…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 13:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d3d54b7a8ce15a1565a6c35ff40cf12 SHA-1: 86981ffaf0fc176591ccba8fbf342fb2e01940ac SHA-256: f6e90676f00c792f547f639c2978d4cc42801385b25bcb0f60adb31e7d4dd9d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting it's designed to redirect users to potentially harmful content. No scripts were extracted, but the structure and embedded URLs point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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://pistant.ru/uplcv?utm_term=my+texting+app+keeps+crashing+android PDF link annotation
    • http://culvercity.ilovepokebar.com/uploads/files/25451930414.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c73935f16a---40023313622.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/guxezijuwoxevagumu.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/mesira.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/wonikuxafodisum.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/xapibukaginegixana.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/31741065896.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/6284849388.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/gijexuginawasanovopa.pdfIn PDF document text
    • https://phm.vn/upload/files/10928202087.pdfIn PDF document text
    • http://abnicum.ru/files/file/32709452430.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/8742006741.pdfIn PDF document text
    • http://maulich.vn/attachment/files/gigepipeluvoxezudopan.pdfIn PDF document text
    • http://prosquash.by/data/28663256014.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/56494590690.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/28289829042.pdfIn PDF document text
    • http://origo.ws/userfiles/file/13186592360.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcdbd956e4---gedusepodere.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/54425384342.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/37818099853.pdfIn PDF document text
    • http://trevorhannant.com/gupepotibeletevumip.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/73457269185.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/96089042989.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/zunizedi.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_off0000b1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A0 16856 bytes
SHA-256: 74755145ab12bfa94cd1330d543a0a91adba9602d96a955f55fef8ac74d46126
font_01_sfnt_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 11048 bytes
SHA-256: d6f651fb9b5b30d6453f0481a291494c311c0e414cd4ba8ed5d6279e63393dc9

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