Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ea41e13a5a3420…

MALICIOUS

PDF

75.0 KB Created: 2021-03-16 22:42:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8c5be729fe34c6dde160a77bac22c777 SHA-1: c89e8d368d883d5f6a34a167d47b16c5110e534b SHA-256: c6ea41e13a5a3420a2b7a092ed992b3e3612ff0410d8b7e47bac709b5c636583
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a prominent one leading to 'seumenha.ru', disguised as a user manual. This URL is flagged as a potential SEO redirector, indicating a common tactic for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to distributing further payloads or conducting phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/wix?keyword=bradley+electric+smoker+user+manual PDF link annotation
    • http://ontrade.top/shrek_original_bookkedch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388432/normal_5fc8608c84b4f.pdfIn PDF document text
    • http://7gusevshop.space/582026332723a21k.pdfIn PDF document text
    • https://falijufik.weebly.com/uploads/1/3/5/3/135349852/57ad91929c858.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389104/normal_5fed7728ea688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_6030dba07a117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5fe77cf2350ed.pdfIn PDF document text
    • https://zumuwezejulo.weebly.com/uploads/1/3/1/4/131455722/d2e0e.pdfIn PDF document text
    • http://rimaloxal.22web.org/beginner_guitar_chord_progressions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_600b506103246.pdfIn PDF document text
    • http://walkover.me/lazarurmwp5.pdfIn PDF document text
    • https://wisemidotoveto.weebly.com/uploads/1/3/4/3/134349295/15627e53eaa9.pdfIn PDF document text
    • https://mulikejigezom.weebly.com/uploads/1/3/5/3/135351375/didopoze_misisalir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bogijexu/que_se_necesita_para_ser_agente_aduanal.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/tirabijovakonis.pdfIn PDF document text
    • http://roparewuna.rf.gd/54770992634.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/cbse_net_exam_november_2017_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/acer_one_10_s1002_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/json_formatter_class_c.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/dagatewaki.pdfIn PDF document text
    • http://dogufisojorosef.epizy.com/13696688816.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/video_editor_for_android_no_watermark.pdfIn PDF document text
    • http://fonaxipovun.epizy.com/fomogelunufugevuzed.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_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 5300 bytes
SHA-256: 638e2204194ac127f8f39ffcc44571a710d7cb9e39bc9d245712944bdc1a7408
font_01_sfnt_off0000faa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA9 10500 bytes
SHA-256: 6675d00e885547c919b635a8c399e859fb0e9de1a74e9cd43e3eda13332b37aa

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