Malicious PDF — malware analysis report

Static analysis result for SHA-256 71031891c8e8c686…

MALICIOUS

PDF

78.5 KB Created: 2020-12-23 08:06:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4914f21963860179913f625555613d24 SHA-1: 722b728f9acefb70870a88c1e5bbe28bba68e34e SHA-256: 71031891c8e8c6866cb9cc29c4d1f1720fece705d8c5449dbe3250cfbf427daa
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain references to 'hobo simulator ps4' and wkhtmltopdf, suggesting a lure document. The presence of numerous external links indicates a link farm or phishing attempt.

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://traffking.ru/123?utm_term=hobo+simulator+ps4 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4448100/normal_5fa2c81491a60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420907/normal_5fac4c1b1ca8a.pdfIn PDF document text
    • https://xomivevisavuwog.weebly.com/uploads/1/3/4/8/134852088/gebufoxemom.pdfIn PDF document text
    • https://geligafut.weebly.com/uploads/1/3/4/0/134012400/862825c68cdd7d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc4e10e2e34347c705dc52c/t/5fcac1cb9d30902cb76b874c/1607123406342/39354289168.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e703bda9c57a97be38fb/t/5fd1d232071bbc68802b899f/1607586355887/juventus_games_2019_tickets.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/zanuwusuzum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce6da45e-944e-437a-a057-85db8ae92587/domon.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/sushant_singh_rajput_images_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf07606d04bc46d03b8070/t/5fd6e668b1c3f31c7a958f61/1607919210744/zoratadunamopudixufu.pdfIn PDF document text
    • https://s3.amazonaws.com/damevusom/chanter_guide_pillars_of_eternity.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe41f3f3de5e49b53071c4/1606304244883/kings_crab_shack.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe02f967ba1bc1885a2a271/t/5fe0e7b53629871941f87394/1608574901800/local_guide_rewards_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/doxology_stars_go_dim_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42f3c08-fdd3-4357-8ea7-d8dcdd29d7fd/94205133845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/639a83ae-b29e-436a-bb31-8341ee4940d0/89791520916.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/xfinity_connect_app.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_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 5156 bytes
SHA-256: b4a6fe00f96473202d5fce3077a3e05db0a540c4dd42472d779d65cd95add1cf
font_01_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 13952 bytes
SHA-256: b08fac8c14a97ac0d23a274b40b1c216c121ede1f03bca14e96467356739aec3

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