Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d81fde55306fee6…

MALICIOUS

PDF

75.6 KB Created: 2021-09-28 04:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7030876684ddb4a72ee7e7853055648b SHA-1: 40e817f731bb8d753572146a4848d507ba4e880b SHA-256: 7d81fde55306fee6e2338da0df9fa04e2f7f6c5180014799da69deaa2cbb0510
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 point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the overall structure suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://garglob.ru/uplcv?utm_term=itube+f%C3%BCr+android+chip PDF link annotation
    • http://ekosertifikat.uznature.uz/userfiles/file/46865629559.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/woleriwagufebinolugefi.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090208465251.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/91353594129.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/22811673609.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/68613832875.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/tupadesenefuv.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138741c25eee---4847027094.pdfIn PDF document text
    • http://panova-art.com/files/file/2902889690.pdfIn PDF document text
    • http://aven.su/userfiles/file/nowalug.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/kaguvizitarebivoxepadi.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/67320999037.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/86363748619.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/nebat.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/bevegarirovizuden.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/79435781749.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/37353113967.pdfIn PDF document text
    • http://e-sheremet.com/img/jidisolodudipulimodepekaf.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/7777119204.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/66120346406.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/xolosedimegulo.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/23836366274.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_off0000ba97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA97 19784 bytes
SHA-256: 0252edb135217bbc2f9c801c983aac06cbd4892b56b591068e540e54c25de3d4
font_01_sfnt_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 10888 bytes
SHA-256: bb02fd554c0a5434145c7f7831d0984144aeda063dae513307def46b0a53b7a6

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