Malicious PDF — malware analysis report

Static analysis result for SHA-256 a504285fdb125fd0…

MALICIOUS

PDF

75.2 KB Created: 2021-04-03 06:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b7693420bac37715a1a9e34020a9f99f SHA-1: dc87490d91ff81bf2d20c682278d7413fcb68aee SHA-256: a504285fdb125fd0258cd10a94b7fb475921135b02e61cd333d52421cfd6add7
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous external links, including one that appears to be an SEO redirector disguised as 'home gym instructions'. The primary malicious URL identified is https://baarspo.ru/strik?utm_term=marcy+diamond+elite+home+gym+instructions, which likely serves as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=marcy+diamond+elite+home+gym+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477910/normal_6019aceca4061.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479710/normal_5fe31bf952b50.pdfIn PDF document text
    • http://neuroncraft.online/99517363230l5twk.pdfIn PDF document text
    • http://prodson.fun/bilevawifebiwetonufodadekc3pm.pdfIn PDF document text
    • http://persequenteamsohbet.com/vexekimelidawubogez0p75y.pdfIn PDF document text
    • http://tryici.xyz/220858817607gu28.pdfIn PDF document text
    • http://ellmax-site.xyz/livitomokoxakemelizo7kqvf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443344/normal_5fd07e8c94bcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402014/normal_6035169670c55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_605c2eec62765.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/wixatax/gamamajavirivewepawogod.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/information_about_1st_battle_of_panipat.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_a05c903f4db4413da202c89963b4cfce.pdf?index=trueIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_b03a2a77393e4f028616189ea51a9dea.pdf?index=trueIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_4a7109373dce4ee98e5166006e60f668.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/masterbuilt_electric_smoker_recipes_chicken_legs.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/one_less_bell_to_answer_sheryl_crow.pdfIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_20315e0071504d7080d98f508f0f2cb1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/96483935888.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/67937149974.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_off0000e5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 5460 bytes
SHA-256: e2fadb9da8da98783cdbf2e392274d3631d94fa7897009e89fd8cada1f27dfbc
font_01_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 10920 bytes
SHA-256: 780e820cf2b3e6a0dd065aaa31ea4fc54be842edc07c286934fca8026d373684

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