Malicious PDF — malware analysis report

Static analysis result for SHA-256 baca4c92fae8bc64…

MALICIOUS

PDF

78.3 KB Created: 2021-01-30 05:16:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 13acba56186727591d6f22aa442c3017 SHA-1: 28972563147a96c1fd6a006a93fe42b9a9720498 SHA-256: baca4c92fae8bc647993e667d267220a8d608b3fbf2628e404030bcb1f167eaa
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and lead to redirectors, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/aws?utm_term=battery+capacity+tester+pdf PDF link annotation
    • https://cdn.sqhk.co/lulaxujik/fGhdEhd/flower_artificial_online.pdfIn PDF document text
    • https://zarojapejafaro.weebly.com/uploads/1/3/5/3/135347044/8237922.pdfIn PDF document text
    • http://wezugeviliwibu.iblogger.org/sekagozezovebalog.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/bgGGQy1/messenger_app_connection_issues.pdfIn PDF document text
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/04b0f5eb4ec8.pdfIn PDF document text
    • http://edaruzal.xyz/71270943448zr8bq.pdfIn PDF document text
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/nuvakagole.pdfIn PDF document text
    • https://wixurawitubeza.weebly.com/uploads/1/3/4/3/134319602/mozagafobizoveti.pdfIn PDF document text
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/5805436.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/1d7a660082500.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/hfghLyq/ates_ve_su_3_oyna.pdfIn PDF document text
    • https://zebomutob.weebly.com/uploads/1/3/2/6/132696512/b63b9dc1b0d.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/gcFghBv/phoenix_weather_october.pdfIn PDF document text
    • http://datekal.22web.org/vuvarimukorekifosibijow.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/suxugipipolazog/50893774254.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/new_catholic_encyclopedia_vol_11.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/america_s_got_talent_2018_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/nunatibujuvewezewenaduv.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 5268 bytes
SHA-256: ac68ed20d29dc599bc4d7cd261e02dbd7147cc107ae85c2a80337edee1654345
font_01_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 10312 bytes
SHA-256: effcaed87770db049792d84f78deacc56af61a2df2d9b0ef571bc7ca874baa0b

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