Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ddb10a5e7845f81…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 11:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d07728272dee06b66913b285efa6617 SHA-1: 157db12a083437bf056fdb6363067ba1c25903d4 SHA-256: 7ddb10a5e7845f81276ecc46106ff6f61b974f7cb347a535563bb63bf3441b91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous external URLs, many of which point to potentially disposable hosting, suggesting a link farm or redirection mechanism. No scripts were extracted, but the presence of external links and the high confidence verdict suggest it is designed to lure users to malicious content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://rpdev.org/ckfinder/userfiles/files/kuwopap.pdf In PDF document text
    • http://greenplanetnepal.com/userfiles/file/9589328300.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/nubogawi.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/97104466923.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9ba18a71b39e26c91b3f5e46dd7a899a/13128573951.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/mitugodewizimixobavesa.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/57201041877.pdfIn PDF document text
    • http://yztools.com/images/upload/File/58932779278.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/20195295123.pdfIn PDF document text
    • https://eclearusa.com/images/file/kefulibe.pdfIn PDF document text
    • http://laserinnsbruck.com/static/22239017836.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/53493964974.pdfIn PDF document text
    • http://cnfglgreat.netsociality.com/upload/files/zuvejusemar.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/rijizoxo.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/67453388443.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/37750164813.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/tetukefebifixisavefemiza.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614dbecb3c45a---54620528661.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210919_AA0503A9263A24A4.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/97599683440.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/fuwemosagaki.pdfIn PDF document text
    • https://qkon.ca/images/file/88265566109.pdfIn PDF document text
    • http://mlight.cz/archiv/file/fujaxomesimezekelimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=create+android+app+intellijPDF 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_off0000accf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACCF 15160 bytes
SHA-256: ce9f3149bf59928fab920214f76ba0933c6cd26774e3eef6a4fb4f19368147d6
font_01_sfnt_off0000d2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 10380 bytes
SHA-256: adbe5871782fc94889150d122ac106a37a8db0f3b694f266e3771ec7bca9d9c8

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