Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8becd0849ea4c63…

MALICIOUS

PDF

75.4 KB Created: 2021-03-03 19:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9c91b0dab12a0e65dbc7c94d11cccad8 SHA-1: b0aa0ddf67640cf2c7ee289254f7dc9c027a2a9c SHA-256: b8becd0849ea4c634634d28dfe15dbf5b547568a904bd71435ce825fb3e962b8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or link farms, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest malicious content, likely phishing or a link farm for SEO manipulation. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but no direct executable content or script was found.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=does+hyundai+offer+free+oil+changes PDF link annotation
    • https://cdn.sqhk.co/fodexuxefeba/btQuhac/tojeralekag.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/iLhcvhb/dream_piano_apkpure.pdfIn PDF document text
    • https://nebakeji.weebly.com/uploads/1/3/4/6/134649015/3249399.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/OghgijB/94115563231.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/dPjjKmo/55038601498.pdfIn PDF document text
    • https://dinuboxisoxim.weebly.com/uploads/1/3/1/8/131857966/2110790.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/jiboforazusofame.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467318/normal_5fe1cd6cc2b6f.pdfIn PDF document text
    • http://zedateve.mypressonline.com/how_much_is_a_rinnai_water_heater.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/ijng3jj/turazekusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403684/normal_5fdbd017c5ef3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403415/normal_5ff81324733ec.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/tRhaNNh/tiny_bird_garden_deluxe_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rizivubonulej.atwebpages.com/who_is_carl_rogers_humanistic_psychology.pdfIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/microlife_blood_pressure_monitor_replacement_parts.pdfIn PDF document text
    • http://keregimuw.onlinewebshop.net/best_stock_broker_for_beginners_in_india_2020.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_off0000e99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 5384 bytes
SHA-256: c7cc4340112a775374fb238c469931e6c6c0be36065b8b1a2c69568146f56c22
font_01_sfnt_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 10620 bytes
SHA-256: 46f9c1d856ba71b2ff4342193f32e4365e3ea4341add2564b0fcc93b36dd7e19

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