Malicious PDF — malware analysis report

Static analysis result for SHA-256 15898cb7c77e8e83…

MALICIOUS

PDF

66.3 KB Created: 2021-01-24 04:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e398872301e46f2633c7bc42a78408c4 SHA-1: cbc78c0f2ecfacb32631545748836f3798a5686c SHA-256: 15898cb7c77e8e83ca7f95f1b892e6e3b81c08e7277897793016425d423d07b2
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and numerous links suggest it is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=bob+books+collection+1 In PDF document text
    • https://site-1173482.mozfiles.com/files/1173482/jivikesabox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450514/normal_5fe6b3cd94ef3.pdfIn PDF document text
    • https://site-1168029.mozfiles.com/files/1168029/kiguvuguxopovaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452861/normal_5fd61bd9e15ee.pdfIn PDF document text
    • https://cdn.sqhk.co/wisulekekij/aazgjja/standoff_2_download_pc.pdfIn PDF document text
    • https://site-1174218.mozfiles.com/files/1174218/a__m__full_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380228/normal_5ff106d17b7bf.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/jjgjjji/.pdfIn PDF document text
    • https://cdn.sqhk.co/dujepiwewi/dgfsXJr/bollywood_songs_2018_mp3_download_mr_jatt.pdfIn PDF document text
    • https://site-1168003.mozfiles.com/files/1168003/motoxewegusunonedalefim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5ff9e8c222bd5.pdfIn PDF document text
    • https://site-1168290.mozfiles.com/files/1168290/37920985261.pdfIn PDF document text
    • https://site-1168117.mozfiles.com/files/1168117/5031802040.pdfIn PDF document text
    • https://site-1178798.mozfiles.com/files/1178798/piano_man_chords_e_chords.pdfIn PDF document text
    • https://site-1168079.mozfiles.com/files/1168079/43961971544.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459170/normal_5fcb9a82f1f60.pdfIn PDF document text
    • https://site-1196822.mozfiles.com/files/1196822/xipugovabafunuzol.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/cbgeWuy/81351252722.pdfIn PDF document text
    • https://site-1166082.mozfiles.com/files/1166082/dokezezagurodexe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389823/normal_5fdd804287313.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383923/normal_5feba4637a693.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC917 4792 bytes
SHA-256: 0e7de64360b5d13a9a91f07fdd513f7738cb3b1ce3bf31caa3647043fd6b249d
font_01_sfnt_off0000d987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD987 10056 bytes
SHA-256: 9c95d58c481a9dd3b81d6cbdc4422ae1f9cfe810778d64129c892aeac2f054cb

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