Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb7fa51e5b11630…

MALICIOUS

PDF

68.9 KB Created: 2021-03-09 14:32:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05e16348f39fb7fa12c64c96dba054b9 SHA-1: 87a4532b7b4671e78dbe89bbae4722d414503859 SHA-256: 2eb7fa51e5b11630df4a8d1622ec888d2f6ea5b07fad87357ea9d12ac68d27dc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable hosting services like Weebly, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs and the structure suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=how+to+prepare+for+dental+implant
    • https://rirupalolidofe.weebly.com/uploads/1/3/4/6/134601765/de4f72740b6fcd.pdf
    • https://vifozafep.weebly.com/uploads/1/3/1/4/131407061/matomozelowepa.pdf
    • https://xudomulur.weebly.com/uploads/1/3/4/0/134040538/ropenogimoj-xutiwiwudelige.pdf
    • https://kasezikibojeg.weebly.com/uploads/1/3/1/8/131871727/liwadusib_nebofoxodurux.pdf
    • http://moshon.space/michigan_archery_tournaments_2020bs6fo.pdf
    • http://allfreebets.ru/save_r_script_asyz77u.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_7793895e17c847bbb6030def218c9a27.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d73a6bb9-24ce-4eaa-adb3-e5f5c8073bd8/wheel_of_time_trailer_super_bowl_2020.pdf
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_f1f8ae66f064437da708987c7833a568.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9c79227a-35c3-4297-ad6c-5a3c76c3b705/gefukikoxazisun.pdf
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_1b04e658017a412e951c42ce5ad69107.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4f709be4-5de4-48e0-8c88-e9450dfcd21b/gary_vaynerchuk_book_suggestions.pdf
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_4104fc4fac3d4bb0ba40cafe907de1ca.pdf?index=true
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_4d600e8b65064e5b8a1dbed98996b120.pdf?index=true
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_be6d7a3fcbbe4fafa38e8b465179dc63.pdf?index=true
    • https://cfae799c-d04a-4395-b2c2-700dffd2ed5c.filesusr.com/ugd/15504a_ec5867d7594f4ebca1a961c2c4cd8925.pdf?index=true
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_23447fcf61e94339b6dc64d86a68dc05.pdf?index=true
    • https://uploads.strikinglycdn.com/files/272ea6fe-68e4-4e17-9e3c-dc3aee276661/how_to_make_warp_drive.pdf
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_c0c6f00dc7014f73b0016f5230228152.pdf?index=true
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_f4a3ebde156a4cc493dee20249e849c7.pdf?index=true
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_70c352b6ecb642d6bc2c9df9aac729d9.pdf?index=true
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_0d2dc78c388a431eb2ac5a8606796569.pdf?index=true
    • 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_off0000d210.bin
f85b85a875050a33885f49f26bdeb81f0e35032cd98e515e5572a2069200875c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD210 5064 bytes
font_01_sfnt_off0000e344.bin
5881eb8b0d9b23b194f097a19a38c3e5c6061a3ec03530540f09348ca45570ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 10276 bytes