Malicious PDF — malware analysis report

Static analysis result for SHA-256 045e0ae39d683d67…

MALICIOUS

PDF

84.1 KB Created: 2021-09-14 02:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: ddfa9aadfe297eb0a261259783911efc SHA-1: 4c6736ddd5d02ac9c993a4100f8f342e00c96765 SHA-256: 045e0ae39d683d67814ecb78e29fbb6ab30f80e7355044b1cec0303dee72393e
126 Risk Score

Malware Insights

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

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 0.9977

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://iphastkala.com/userfiles/file/38214718609.pdf In PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-12/20210912161558631952.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/dubuwudiva.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/45098780897.pdfIn PDF document text
    • http://indemo.pl/Image/files/vejovebaxot.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210914_6DD753DCCAC54DE3.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/fetevulosefided.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/gobolagutem.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ab493e746---zunugaruvurugumuzapefo.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/33579938758.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/zododadomuxixoto.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/87322916586.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/20837630617.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/lezigutimokogosap.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/47067394345.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/75446730409.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/lufuroj.pdfIn PDF document text
    • http://hopkim.vn/upload/files/33371128474.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/purefilizozajupa.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4d0ddfbfe1588fcda7684dda150ffd22/27503704711.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/88347202175.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/bajabategad.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/6252020742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=agni+kernel+redmi+note+7PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCD 10384 bytes
SHA-256: ecd72dbf2043f2cb3baa6e7e93f730d02bdfa1946afbb69f20353e10b1ad1580
font_01_sfnt_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 19368 bytes
SHA-256: 017553ee00fdcbaace0e091e116b322d352e0c956b5c489376c50a7a150f461d

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