Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3edd1648eca3a8…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 19:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dafc12930a08d9b956361192c5704db4 SHA-1: 1d4d5e20f314ab952f2073895b2e7e3c7d8d67f9 SHA-256: fb3edd1648eca3a833dcbbff1a4d325f40fc25505507da9b090b3fb57be9580e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting a malicious intent to redirect users. No scripts were extracted, but the presence of external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=kiss+the+rain+sheet+music+pdf PDF link annotation
    • http://pro-elec.ru/ckfinder/userfiles/files/81918446544.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/74322319467.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/gukob.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/2039392036.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/51573494067.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614273441dbe3---gudomubumokufenalid.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/32658932134.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/16749117322.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/losonijuvizikezazinivurux.pdfIn PDF document text
    • http://sinners-party.de/media/file/dedisewo.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/gizetar.pdfIn PDF document text
    • http://sparkpro.lv/content/file/71926847923.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/masitakibitomedukazi.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/pagezasuf.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210909091454.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/xigibi.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/voxivajuza.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109111708067752.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/pexafus.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/dipebupotekaropotekofej.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/xagetarodafu.pdfIn PDF document text
    • https://limsurempat.com/contents/files/pozovuduferunilo.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_off0000e309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 17340 bytes
SHA-256: c375794cc39ff2b331f52c05dc770e5c706c632ef2b1b5a9df997e2f740a0ba9
font_01_sfnt_off00010fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAC 10808 bytes
SHA-256: 272a7ca8981ea7888c476d955487d5698f11dc023ec87c35832680e28a1a836a
font_02_sfnt_off00012867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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