Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be276d7580f1884…

MALICIOUS

PDF

76.0 KB Created: 2021-04-14 00:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7fd2fade6bb0a793970ec42a1762f74b SHA-1: 9df80013046ec173d59eb8b9e7c05d933495ba49 SHA-256: 4be276d7580f1884e1c5063f7789194f4d87ab999ac7222c27f2125880bc8494
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded content, though heavily obfuscated, appears to be a lure related to portable air conditioners. The presence of ClamAV detection and ML flagging indicates malicious intent, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=what+does+p1+mean+on+a+portable+air+conditioner PDF link annotation
    • https://lipijubirenazob.weebly.com/uploads/1/3/4/7/134722159/72ab1.pdfIn PDF document text
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/gigalumexinuf_zawijijezado.pdfIn PDF document text
    • https://kanudepu.weebly.com/uploads/1/3/2/7/132740929/wekunosab-tolufalevige.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/iajgiPM/jewuloferoxoxoj.pdfIn PDF document text
    • https://sebaderibegagib.weebly.com/uploads/1/3/4/5/134583030/wowemozufa.pdfIn PDF document text
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/nubuxafoj_xobigepo.pdfIn PDF document text
    • http://bloodcraft.online/65935696321vu3rg.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/mWggUjh/kodiak_bear_bites_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528780/normal_6033f451b9eb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_6048099cf01e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473637/normal_5fe9587953fd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374533/normal_5ffdf227cb02f.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/oigcii8/savings_goal_tracker_chart.pdfIn PDF document text
    • http://belplitka.ru/nuwave_36001_brio_air_fryer_accessories5mk33.pdfIn PDF document text
    • https://sejumajofejopib.weebly.com/uploads/1/3/2/7/132740214/gagedomexipubutebufa.pdfIn PDF document text
    • http://optalpha.com/bissell_pet_pro_carpet_cleaner_how_to_usezojht.pdfIn PDF document text
    • https://tezenilul.weebly.com/uploads/1/3/6/0/136085996/8656950.pdfIn PDF document text
    • https://cdn.sqhk.co/fowurona/hqhbHTt/1630101671.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/MZJjfuY/39185195305.pdfIn PDF document text
    • https://varovugunigode.weebly.com/uploads/1/3/4/4/134480676/e7f5820f9f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e35b969-1f99-48dc-8aa8-d0fb9638bdc8.filesusr.com/ugd/970baa_660b8616f6f54ce6b78ff19477c35755.pdf?index=trueIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_dfea71666a414dc6ab89186099ba6aef.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_feba433998564b199f7380d990f27713.pdf?index=trueIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_dc4fefb109c14f488d903e2602089791.pdf?index=trueIn 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_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 5516 bytes
SHA-256: 30f96bcfcde9a2f4347b164d16be2479c522bbc41aa06e001827e4c2c581c7c0
font_01_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 10640 bytes
SHA-256: 4521b881cd8a8145078489eac28d89ad397e3d50d148d0785dd6366e58aed85c