Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4e76061a485863…

MALICIOUS

PDF

68.0 KB Created: 2021-10-04 01:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9514a313e4c68073d80efbd9bfe30081 SHA-1: aa7f56a56876b11ecf557241d42820507754203b SHA-256: 1a4e76061a485863997fb1240fee13d2db1a276ac982161fd73cec1ba06110e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a link farm strategy, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://ketchas.ru/uplcv?utm_term=word+section+numbering PDF link annotation
    • https://dorfadvertising.com/ckfinder/userfiles/files/tiguzaziti.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/96017832991.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021917550307518.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/25986929453.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/30459697858.pdfIn PDF document text
    • https://simorgh.it/uploads/file/97169981292.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/24417863493.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140073e6b340---91931417924.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/sinuvuxedigixuna.pdfIn PDF document text
    • https://ags-car.com/upload/files/talixazo.pdfIn PDF document text
    • https://ms01bet.net/contents/files/29923091958.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210927194152.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/46608161881.pdfIn PDF document text
    • https://babamansurkurhuseyin.com/uni/yuklemeler/file/wepamexubebuxikuraje.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/81488709313.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/zunafefofusasakof.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/juwelaxuseri.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/97858330228.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/93841447790.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/vexolenofigarovi.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/41146148819.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/xuzegemuduwinutarosel.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/riwusekogul.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_off0000acc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DC 10740 bytes
SHA-256: a7ae1762714e0ebe482eeddb72893da955f2e83baf08d8238d7420930a1ef90c
font_02_sfnt_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 14924 bytes
SHA-256: 4d475410fdf3d6a99aaa53851d3b05ad643a32e1da757bbae60ab32d18082867

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