Malicious PDF — malware analysis report

Static analysis result for SHA-256 306ac38efc710000…

MALICIOUS

PDF

77.0 KB Created: 2021-01-01 09:35:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 037600f47eac133fc150ba73b2756fda SHA-1: 1648b38a4a5d8139367b5e892f717d222d92ac1e SHA-256: 306ac38efc710000ea67e2c4e60ae3e1405d816c336cab34430ed26ce7d6e4ea
244 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or redirection attempt. It contains a link farm designed to direct users to external, potentially malicious websites, with one URL specifically identified as a known malicious redirector. The document's content, though obfuscated, appears to be a lure disguised as a worksheet answer key.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://cctraff.ru/123?utm_term=trig+identities+worksheet+answer+key In PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/melubuxam-xujewaselo-rebilinovux-debupizusi.pdfIn PDF document text
    • https://cdn.sqhk.co/salefudodid/FDDSiib/super_adventure_box_music.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/3f0c0d4a.pdfIn PDF document text
    • https://kufepodesaf.weebly.com/uploads/1/3/4/3/134336702/d2d27bd017.pdfIn PDF document text
    • https://fenivubad.weebly.com/uploads/1/3/4/4/134482284/8ce332bd7d.pdfIn PDF document text
    • https://vozexipazaxa.weebly.com/uploads/1/3/4/4/134444785/wuxuwitiruk-derexomijute-beligiboz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbac9db4-0d7c-4336-8fa3-c944d12793eb/best_color_laser_printers_for_home_use_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/bruges_street_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c35b290e-fac8-40de-ab87-0d816e3bc881/fatedibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad43eeb3-ac60-4f2f-90cf-6f8b4b5dd578/fowimadotogikomukew.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/sanoxomatixazagananuvegap.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/wenusezobupaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97897c15-5cd2-442d-844a-41c4fbed21dc/my_dog_licks_my_private.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/fox_tv_guide_phoenix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14f8841f-8147-481d-b6c1-dc164c9408c1/juwodikosevokoxavepanop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de224c2-da70-4321-864c-b1219073ce7b/1204385877.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AA 5260 bytes
SHA-256: 7985fe7f11344a307f1130d2eefc6499cdffdacd6ca5376ad2aeafa23abe5a36
font_01_sfnt_off0000e8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 12008 bytes
SHA-256: f72fc669786390d500fa60661fa7a620853e6718ce84874ec8e24e39ecc0ff7b
font_02_sfnt_off00011158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11158 16144 bytes
SHA-256: 34d28ad3adac05e8f755c9f33ce6b8cf5b7070daa50a4bc464e3c9fdb6e24c7a