Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1202a445e1edbe3…

MALICIOUS

PDF

85.5 KB Created: 2021-04-01 02:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6c1650a8013dcf5550b9542fb3198a1e SHA-1: 7806b2e064ecf215a62c822ead7f258d15338527 SHA-256: a1202a445e1edbe3a37ef302ba6dcc4edcad57f37490661997ac3aa6cd413c3f
244 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 disposable domains, indicating a link farm designed to manipulate search engine rankings or distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the PDF as a link farm on disposable hosting. The ML classifier and ClamAV also strongly indicated maliciousness, with ClamAV classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=wheel+horse+garden+tractors+for+sale+uk In PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/asia_political_map_blank.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405184/normal_5fd05f7c4bb03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_601176fec299c.pdfIn PDF document text
    • https://mubonunegaj.weebly.com/uploads/1/3/0/8/130874179/surowe_zutesuzuvofax.pdfIn PDF document text
    • https://rabidibizuzej.weebly.com/uploads/1/3/4/6/134648686/xekugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504554/normal_6024738d0ed35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_603632f9452b1.pdfIn PDF document text
    • http://batedezid.iblogger.org/44511914310.pdfIn PDF document text
    • https://xapowukugo.weebly.com/uploads/1/3/4/7/134702937/javogis_tofasanavuta_vafasiwe.pdfIn PDF document text
    • http://pirojibanenuzi.getenjoyment.net/59666333708.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368736/normal_5fe2ab32117eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roniwixanedif.epizy.com/how_to_use_visa_gift_card_on_twitch.pdfIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_5821c1d39ba6401bb5b114b6d883f4d5.pdf?index=trueIn PDF document text
    • http://wuragumok.atwebpages.com/mesa_boogie_mark_iv_combo_for_sale.pdfIn PDF document text
    • http://masemipeba.myartsonline.com/67448142841.pdfIn PDF document text
    • https://c9977776-9e37-4432-9eae-e541147807da.filesusr.com/ugd/bb6cc6_1fae0aeacdbb4b16988f0befc0da762f.pdf?index=trueIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_86ffadb273d040d68b46aa188439bdcf.pdf?index=trueIn PDF document text
    • http://zipulosi.atwebpages.com/pivedetodedido.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_ba901d09cb484912a45310f027761139.pdf?index=trueIn PDF document text
    • https://37459de8-d961-4a2a-897a-801dad55dcfc.filesusr.com/ugd/1395e2_90a90ecb05ae4433a559173333f6bef4.pdf?index=trueIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_219ab25d181f4eae92178318ac73438b.pdf?index=trueIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_0ab620b915c248d48a75b70a3b964c0f.pdf?index=trueIn PDF document text
    • http://gobovavori.rf.gd/lezaxobugitugaluf.pdfIn PDF document text
    • http://mexejuxoxaf.epizy.com/rules_of_play_game_design_fundamentals.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_off00010f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F34 5360 bytes
SHA-256: 96db603fd705f04749f1633b73c64696c82ed75fcb844786bd8445d3e168de7b
font_01_sfnt_off00012179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12179 11572 bytes
SHA-256: 47bfed6bffa58edb3373661bd9dd064d6431e54eb4b61d7c0faaca7a815ad648