Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a453dccd6abe9e…

MALICIOUS

PDF

72.1 KB Created: 2021-09-21 05:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e837e4b54c275ab88b4933e524fda1a6 SHA-1: 786fcc77581ef8ae36b7480037fe6b4f514571b4 SHA-256: 93a453dccd6abe9e0acf094bf665c0912df5b11c67bfc3c2bbf79dd5ffbb4102
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=block+tanks+io PDF link annotation
    • http://trans-serwis.com/userfiles/file/witosirakexofixumeval.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/foruxuzilu.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/30709870967.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/33269130127.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/bowuzilasivabadavamoxivef.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/47499528906.pdfIn PDF document text
    • https://ags-car.com/upload/files/talixazo.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/rufuwazotikuso.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/13242710872.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/bumurideredowavesomek.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/98615614506.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/fusezoporomivozipukezos.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_19_02_12_47_2936.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/54592900103.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/mafirafotemuwazali.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ira8c6f9p9q5p8g52f0rko3o38/72690890797.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/86184633818.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/datojukubuwavofewu.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/fabawumajisaginajekigu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f62f6bc196---robiginepitiv.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/vomupijenijakuvegeguduna.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/76561988527.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/88393575520.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_off0000ba1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1F 16384 bytes
SHA-256: bc6b171a44bd32d6d1bcf0cd1996067317aab08d44929f60bbbad5ca1a601971
font_01_sfnt_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 10136 bytes
SHA-256: 11174555fa881091a87369253e5fb8a93169fc7002b07aa0276e953c688e11a1

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