Malicious PDF — malware analysis report

Static analysis result for SHA-256 d550251bb02ce189…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 01:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56a9ecc64f6ee1f06f4ad267791a5a9c SHA-1: 6b20cb405cba202d05bfee79291b266e6e8f32cf SHA-256: d550251bb02ce189f8bafa5187f6d54675178477e0c809297241e27ba8271834
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://queure.ru/uplcv?utm_term=endless+temple+lost+oz PDF link annotation
    • http://mai-colle.jp/userfiles/file/37623780971.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/7446976549.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/fenovepokutivaratak.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wenorarirazumevexofit.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/fipemiluw.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/pexaniboxok.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/62632762678.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/teredefigutugerixuxamodej.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/ruvidowe.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/12017292199.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/faxem.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/27664334884.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/zujonafegevusenadapife.pdfIn PDF document text
    • https://unitjaya.com/contents/files/nokomijififef.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/dokiludizokem.pdfIn PDF document text
    • http://npas.ru/pic/file/73146324251.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/99696025541.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/18368953971.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/piduwow.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/19339972154.pdfIn PDF document text
    • http://dogwarts.ru/sites/default/files/file/77363084713.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dotabowa.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091110100280.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/98559594119.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_off0000c99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 17308 bytes
SHA-256: 0c41cca7c84ca5d7cb2094dfc4a0a0cb6558ec5d75f2b5c7c3a5e811a42e4c5b
font_01_sfnt_off0000f65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 10240 bytes
SHA-256: a55235a6b795d602a24abf76a893ba409144b046a421cb189a08e48aa91baec4

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