Malicious PDF — malware analysis report

Static analysis result for SHA-256 77df65a44faf3844…

MALICIOUS

PDF

87.6 KB Created: 2021-04-04 12:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 20003e594ad004a9a9aac6c98fb7a363 SHA-1: 23f696fb13f69a826733f04e889286b78f9c4c5b SHA-256: 77df65a44faf38443080ce1c7d0a670e984f0470bfdf3d6518956b7151604c49
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The embedded document body text is heavily obfuscated and appears to be corrupted, preventing a clear understanding of its direct user-facing purpose beyond the lure of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • 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.
  • 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://gimoguvi.ru/strik?utm_term=percy+jackson+and+the+lightning+thief+book+chapter+1+summary PDF link annotation
    • http://boxoxafu.iblogger.org/smart_watch_u8.pdfIn PDF document text
    • https://pojalurerisufi.weebly.com/uploads/1/3/4/1/134109142/wafami.pdfIn PDF document text
    • https://dibumofum.weebly.com/uploads/1/3/5/3/135313591/8872701.pdfIn PDF document text
    • https://tepidupelagoxu.weebly.com/uploads/1/3/4/4/134472529/e47d51623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423148/normal_60366ac2b362d.pdfIn PDF document text
    • http://tikovg.xyz/8824284772tomm5.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://vuginavoji.weebly.com/uploads/1/3/0/7/130775358/402596.pdfIn PDF document text
    • http://obuv-kozha.ru/39586782217gopsm.pdfIn PDF document text
    • https://tozarezev.weebly.com/uploads/1/3/4/3/134374844/jisikowegepo.pdfIn PDF document text
    • https://fifikasato.weebly.com/uploads/1/3/1/4/131437502/7920468.pdfIn PDF document text
    • http://fuvirakopu.iblogger.org/migotodawebupan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_6063d71a424b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371266/normal_5ffec385051b5.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/192bb57a1e97.pdfIn PDF document text
    • http://gedenidaxinexo.22web.org/rajasthan_patrika_bikaner_download_today.pdfIn PDF document text
    • https://gekowodi.weebly.com/uploads/1/3/5/3/135321574/kaxow.pdfIn PDF document text
    • http://tovarzone.ru/winrar_with_crack_64_bitd12qm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_60380f152eeeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xetulugesoboko.epizy.com/microbial_ecology_atlas_bartha_download.pdfIn PDF document text
    • http://pekotezubefem.rf.gd/37483853475.pdfIn PDF document text
    • http://zuzinaxawalodi.epizy.com/app_development_business_plan_example.pdfIn PDF document text
    • http://fozinudar.rf.gd/closet_dimensions_guide_in_cm.pdfIn PDF document text
    • http://tipixerokofor.epizy.com/systems_of_linear_equations_worksheet_answer_key.pdfIn PDF document text
    • http://tepoguko.epizy.com/xobuzuporuwexow.pdfIn PDF document text
    • http://vepilezora.epizy.com/missguided_promo_code_ireland.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_off00011671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 6004 bytes
SHA-256: b401f095e52461c1edc05a28f0929bd303e3657ae56cb5f7bb2aeefa183175bc
font_01_sfnt_off00012acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACF 10448 bytes
SHA-256: b6a7225b97602ee78eb0baf8d96b0b2a50a16177330e6b7b490eed43c6e1084a