Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6bc793f964943a…

MALICIOUS

PDF

66.2 KB Created: 2020-12-26 08:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2211e6095136c10f0c85895120ddbc62 SHA-1: 7ab4f2e6144837cffc0c414cd990a7486e859e30 SHA-256: bf6bc793f964943a368396825445ceac740959b7c74ff3d5fd19a201f3b2e39d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to redirector infrastructure and link farms, indicating a phishing or ad fraud campaign. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', further supporting its malicious nature. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/aws?utm_term=platform+shoes+heels+purple
    • https://cdn.sqhk.co/xojafimib/Cgj4Vjg/6662737312.pdf
    • https://cdn.sqhk.co/kuzezajolu/ghLDgfu/tumemopamabisufix.pdf
    • https://cdn.sqhk.co/goluxewimabu/Xmge1hj/2020_ford_super_snake_truck_specs.pdf
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/badefedama-nuberi-dubome.pdf
    • https://lotuliwupufak.weebly.com/uploads/1/3/4/8/134873452/6523437.pdf
    • https://cdn.sqhk.co/rinilafexowi/4C95Jgd/activity_launcher_app_android.pdf
    • https://cdn.sqhk.co/fetadupozo/DBxjhjh/wezigejatafonikasa.pdf
    • https://cdn.sqhk.co/jasowipe/mKRoGid/invasion_definition_ks2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/juzowilipi/89947912272.pdf
    • https://uploads.strikinglycdn.com/files/1ef97b29-4b0d-49a2-bead-5a1aeca797e8/78577894395.pdf
    • https://s3.amazonaws.com/befevifa/climate_in_the_piedmont_region_of_georgia.pdf
    • https://s3.amazonaws.com/fifuto/kopoxipakamifalozetobe.pdf
    • https://uploads.strikinglycdn.com/files/794c9122-fb34-4c20-8d9b-22e0fc39a9c7/9480225744.pdf
    • https://s3.amazonaws.com/zemunomipazikez/complex_conjugate_root_theorem_worksheet.pdf
    • https://s3.amazonaws.com/jifesu/xezuvelizi.pdf
    • https://uploads.strikinglycdn.com/files/37c77c3f-3da9-4d66-b040-e30746d80c62/77463477902.pdf
    • https://uploads.strikinglycdn.com/files/c229d4f9-c2f9-4cc2-9715-efd6edd4514f/kotor_2_handmaiden_romance_mod.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c80f.bin
1373001a907133c471409942fe0f9823639c547413461bfee34d9a5b3e127029		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC80F 5144 bytes
font_01_sfnt_off0000d966.bin
2dadec3e9641b8ed5e64bf57bcdaf392aa4eb54870f9bbc131d041b978f3f776		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 10144 bytes

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