Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c7745b3e6a5322…

MALICIOUS

PDF

77.9 KB Created: 2021-03-20 04:51:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8d01d111879d5dcb2e2b018286bac5e2 SHA-1: cbd76d7e53b17a52c0952cbfead659f1eeee51b6 SHA-256: a6c7745b3e6a5322e7c1fffda0a90fce16118829935120a0ace4149fbbdec389
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a critical heuristic and an ML classifier. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of links suggests a phishing or malware delivery attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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=exercise+to+help+scoliosis In PDF document text
    • https://cdn.sqhk.co/jowapezo/hieVoic/rip_2019_that_level_again_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5fd048a34d00d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451575/normal_602a3d6109701.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/baby_einstein_jumperoo_age_limit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481990/normal_600cc1c168744.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471082/normal_5ffec4256a44a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491414/normal_5ffeb2a3146cc.pdfIn PDF document text
    • http://motozed.scienceontheweb.net/angular_7_complete_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_600a5a9846f7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492892/normal_5fe3eef364249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402745/normal_5fe6e455ca81a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392871/normal_5fee10e689cd8.pdfIn PDF document text
    • https://cdn.sqhk.co/fakosopalo/EjghKia/pekak.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/L2hihhm/fallout_wasteland_warfare_settlement_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_601410e826ac6.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/YhdEibG/vupowuxubozanudunipekabi.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/bncc_atualizada_2020.pdfIn PDF document text
    • http://mufosubofamar.mywebcommunity.org/taranitolef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_604de4ff07e8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410222/normal_600a4f8067333.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/3552c0eb-1386-4512-ac27-2100416c79f2/craftsman_leaf_blower_gas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc00c212-16a0-4c36-97c7-84c2b961430f/difference_between_promissory_note_and_bill_of_exchange_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a173f85-39a4-430f-aa45-06eed33a1506/how_to_store_frequency_on_baofeng_uv-5r.pdfIn PDF document text
    • http://jujageritoxo.atwebpages.com/jufuzakefujadifuboda.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_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 4836 bytes
SHA-256: 23eaaab1e2d0e37b3db9b4c456c1aba8b14ca51b5e3d505a7e8d7d48dd85a8e3
font_01_sfnt_off0001075f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 10304 bytes
SHA-256: 9422c279f78b9be434810f75a06ee6f7a3ca9addff60a660e0750297598a30af