Malicious PDF — malware analysis report

Static analysis result for SHA-256 3499823ab561c6a9…

MALICIOUS

PDF

90.2 KB Created: 2021-02-19 00:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bc6cad11daba18f2ee4f2247d21d8f44 SHA-1: 70fc11e87206d665278a4d23f59a39060f60f662 SHA-256: 3499823ab561c6a9dec8f04a0f5d70164c99befb31d603cc916d40336051b291
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document contains invisible links designed to lure users to suspicious domains, such as http://com-login8.xyz/507928141541e70q.pdf. This behavior is consistent with phishing or malware distribution campaigns, where the initial document serves as a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://leonvi.ru/strik?utm_term=nikon+coolpix+l310+price PDF link annotation
    • http://com-login8.xyz/507928141541e70q.pdfIn PDF document text
    • https://cdn.sqhk.co/vazodowadu/id2iahi/lapow.pdfIn PDF document text
    • http://ttop-shop.com/94025391988s71io.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5fca497604816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425009/normal_601df8043ed82.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/Tqgf5tH/download_videobuddy_on_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409421/normal_6026800b2d0dc.pdfIn PDF document text
    • http://deutschebank-meine.com/lunokevarudekutumunel4lu0n.pdfIn PDF document text
    • https://cdn.sqhk.co/jalosemuv/XZ4hbja/revenge_of_sultans_apkpure.pdfIn PDF document text
    • http://frankiearvelo.com/how_to_get_dividends_monthlyx6go1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417138/normal_6005d3720b2b7.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/hhgehiO/talking_kitty_cat_wallpaper.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449177/normal_5fdecbf669195.pdfIn PDF document text
    • https://cdn.sqhk.co/sukurorezib/4ifhei4/38656953277.pdfIn PDF document text
    • http://opensoda.pro/9874663329019otl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/solving_equations_worksheet_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/62222172827.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012e1e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12E1E 26372 bytes
SHA-256: 758d4efbdc08a9051d77328b2bb344e8943114b02a46ccd0dc88e0df490d0376
font_00_sfnt_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 4996 bytes
SHA-256: e609a648567865f61f89d202bc064108d7f6b24dacb0d24ed5177062db5e9d10
font_01_sfnt_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 10632 bytes
SHA-256: 46922db5cbc7927381d31edf00955bace55fa583d58c25e8f0d139b25ca1475d

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