Malicious PDF — malware analysis report

Static analysis result for SHA-256 666d6cd352ede9a9…

MALICIOUS

PDF

76.3 KB Created: 2021-02-14 14:19:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bf6765a6b57b99c444dab07e566a5c62 SHA-1: 666fb7ed66ee6afedef708bfe8843a1833c14cdc SHA-256: 666d6cd352ede9a95ad7c051278c6c0dbfbe6c93a2d9b305d92698c9b005c43a
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to a theme song, likely a lure. The primary attack vector appears to be directing the user to malicious URLs, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=garfield+and+friends+theme+song In PDF document text
    • https://static.s123-cdn-static.com/uploads/4378378/normal_5ff166d7c8f5e.pdfIn PDF document text
    • https://wapavamo.weebly.com/uploads/1/3/1/6/131637186/0bcd596e4e65d4c.pdfIn PDF document text
    • https://ganafotereko.weebly.com/uploads/1/3/1/1/131164127/86e275a68f.pdfIn PDF document text
    • http://ultra0.space/lavojajovik8mbk9.pdfIn PDF document text
    • http://winclean-shop.space/615710226991secn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482617/normal_5ffefb8b45980.pdfIn PDF document text
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/xepuxegogi_disalekobub.pdfIn PDF document text
    • http://theporte.xyz/shikshan_sankraman_may_2020_downloadnb3sf.pdfIn PDF document text
    • http://giocodigital.fun/osrs_barrows_guide_gearl05pz.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/juvetaso/video_recorder_for_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/auto_manual_icon.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/ashwini_ye_na_dj_rahul_song.pdfIn PDF document text
    • http://gisunomadipoxas.epizy.com/mandate_letter_sample.pdfIn PDF document text
    • http://zilekej.epizy.com/periodontics_carranza_free.pdfIn PDF document text
    • http://buzatagijekoj.rf.gd/guvenokitine.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/71425145102.pdfIn PDF document text
    • http://vaxuxosubize.epizy.com/cade_simu_mega.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 5352 bytes
SHA-256: b20d7a3b9a89d1b5c0d5fe8a54d0976e5b7f4f08e23e2b5950e6b7c920f6873c
font_01_sfnt_off0000febb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 10924 bytes
SHA-256: 1a409c5a1117c5dcd0d6d27379325e776a812ddeb4501bbd8448592a86c0f5be

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