Malicious PDF — malware analysis report

Static analysis result for SHA-256 b187f7372967a2a1…

MALICIOUS

PDF

75.9 KB Created: 2021-04-29 18:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0523bcf9dc3fca0b1e4961e67a26969d SHA-1: 0552b314fba4382fc0ae09a85dd3dd5cc68f05be SHA-256: b187f7372967a2a1852ab551f4cc8bc94012d9133bb476fa0daed47e64bcefac
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'golowaki.ru' disguised as product instructions. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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://golowaki.ru/strik?utm_term=bissell+pet+pro+revolution+instructions
    • https://static.s123-cdn-static.com/uploads/4490266/normal_5fcfe7004c0ef.pdf
    • https://cdn.sqhk.co/sidamebo/ijbJjbv/smartphone_tycoon_2_mod_apk_unlimited_everything.pdf
    • https://cdn.sqhk.co/bifugudawesu/bJgfjfi/gexadugotosejebekir.pdf
    • https://cdn-cms.f-static.net/uploads/4476580/normal_604199bd21bd5.pdf
    • https://cdn-cms.f-static.net/uploads/4423188/normal_60249006823d9.pdf
    • https://cdn.sqhk.co/dugelabomaw/SpifNgh/tinanexifil.pdf
    • https://cdn.sqhk.co/wixedineve/hhnMAhb/derofi.pdf
    • https://galesarenad.weebly.com/uploads/1/3/4/3/134380117/zepasem.pdf
    • https://cdn-cms.f-static.net/uploads/4417128/normal_605e141b2a52e.pdf
    • https://cdn-cms.f-static.net/uploads/4447273/normal_601dae87413eb.pdf
    • https://cdn-cms.f-static.net/uploads/4445116/normal_5fe7ed2aeadb3.pdf
    • https://cdn-cms.f-static.net/uploads/4452608/normal_6020ae3942107.pdf
    • https://cdn.sqhk.co/fowipovoji/Rjcgiha/46167374211.pdf
    • https://cdn.sqhk.co/gozajare/ifieQ2y/papegugal.pdf
    • https://cdn-cms.f-static.net/uploads/4384039/normal_60286d1691153.pdf
    • https://xisovunegukizak.weebly.com/uploads/1/3/4/8/134868464/5859250.pdf
    • https://tafibukazun.weebly.com/uploads/1/3/5/4/135400045/rojobuwiz.pdf
    • https://cdn-cms.f-static.net/uploads/4476593/normal_606ca390f19fd.pdf
    • https://cdn.sqhk.co/jivazufevi/jfx0idv/download_youtuber_life_online_drag_racing_mod_apk.pdf
    • https://cdn.sqhk.co/zaviresodew/Rjc94V0/solavudimizoza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gidibesuxi/aftershokz_titanium_manual.pdf
    • https://s3.amazonaws.com/wowonesoribu/house_plan_drawing_programs_free.pdf
    • https://s3.amazonaws.com/resixexi/price_volume_analysis_trading.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_off0000e922.bin
27fbcfd238f319d6f15842509d45fe7edacdcc78c045ed901073deff27796a43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 4828 bytes
font_01_sfnt_off0000f9ae.bin
a6fbb0c59911452e4fab10e9e66c4d73dc0e71b318516e079ee0a629328aae97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 11904 bytes

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