Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f97cd63502c87f7…

MALICIOUS

PDF

85.6 KB Created: 2021-03-22 03:19:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f5f37876b089bee948339161212ea45d SHA-1: 53ace73c5a483548006c6c2bcea7ba0514f167ae SHA-256: 5f97cd63502c87f76f6b477dd2e093543bd139b1863a523d56a16bf7f385ecda
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to printer setup, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=samsung+ml-2165w+wifi+setup PDF link annotation
    • http://libopadu.scienceontheweb.net/cara_belajar_photoshop.pdfIn PDF document text
    • http://kafidovomiguvo.mywebcommunity.org/what_is_the_world_political_map.pdfIn PDF document text
    • https://befetoxakotupo.weebly.com/uploads/1/3/0/7/130738956/4814840.pdfIn PDF document text
    • http://kitukotobov.medianewsonline.com/lanobapobox.pdfIn PDF document text
    • http://kodimovizi.22web.org/child_by_tiger_story.pdfIn PDF document text
    • http://sitonuba.mypressonline.com/2770299116.pdfIn PDF document text
    • http://xujukega.66ghz.com/network_adapter_driver_windows_10_hp.pdfIn PDF document text
    • https://rixutabenenik.weebly.com/uploads/1/3/4/4/134498467/legonireno.pdfIn PDF document text
    • http://wosozage.mypressonline.com/how_to_multiply_and_simplify_square_roots.pdfIn PDF document text
    • https://wikafifej.weebly.com/uploads/1/3/2/8/132815388/9767692.pdfIn PDF document text
    • http://kefijor.mygamesonline.org/36196426342.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/62195265873.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xowuzaxu.onlinewebshop.net/hip_arthroscopy_portals.pdfIn PDF document text
    • http://peburameg.epizy.com/basecone_spencer_android.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/11860218051.pdfIn PDF document text
    • http://kimawawasero.onlinewebshop.net/82115104806.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/photon_browser_apk_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/siwodezitegilasoge.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/6022342078.pdfIn PDF document text
    • http://dojafeduzig.myartsonline.com/trastornos_alimentarios_unam.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/why_did_the_renaissance_began_in_italy_3_reasons.pdfIn PDF document text
    • http://pavebutom.epizy.com/consumer_reports_refrigerators_review.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_off00011038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 5812 bytes
SHA-256: 9349e30ad15dda9b242796e82187b6e04226a372a95759c9b66e7f6141a1ef8a
font_01_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 10832 bytes
SHA-256: a39be6d73da4fbe186569782495cad6a1278da40d4caabf76e72af718b298740

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