Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2af6fe8ad25977c…

MALICIOUS

PDF

79.0 KB Created: 2021-09-11 05:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 4f2613146cc70743f7329f0351966cc2 SHA-1: 09459b28bd035f3ecac3c82d304afaf89ff55a62 SHA-256: e2af6fe8ad25977c5f352a55c124bfb72da71283ce7a1fab851831ae68112d5a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. 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 0.9981

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://catamma.ru/uplcv?utm_term=how+to+make+mod+apk+in+mobile PDF link annotation
    • http://musicfriend.vn/public/default/ckeditor/files/sepamizif.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/sunok.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/tagefifamoforime.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/02/lomitugodi.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/80410880308.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe0f1a16d8---xitegu.pdfIn PDF document text
    • http://safarang.com/basefile/files/pabiraritinutoxinofugisok.pdfIn PDF document text
    • https://bem-sa.com/img/file/86691131742.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210905013356.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/44197220641.pdfIn PDF document text
    • http://htwy.com/upload/file/kiromatu.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/sopabebeximazajiwakejemez.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/toxafux.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021961219542784.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/93518318091.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/15143743656.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/luzupev.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/mekavimelosigujak.pdfIn PDF document text
    • http://acelybio.com/upload/files/kobumuja.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/94119599326.pdfIn PDF document text
    • http://royalgroup.at/tmp/35653784758.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/wunupiv.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_off0000d10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 10596 bytes
SHA-256: 5f9c9d0f590f5e19207fb1fac443f310228039b9835685aca802229325808802
font_02_sfnt_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 17384 bytes
SHA-256: c2c6d6e9186b51030f9900431bc4fc5093188dbe3e97eb04d766448477af58c3

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