Malicious PDF — malware analysis report

Static analysis result for SHA-256 6338db53cca2c58a…

MALICIOUS

PDF

83.5 KB Created: 2021-03-21 08:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bf0243f5f81aa529fb2735f4a911864e SHA-1: 27767d58a4aa5ee549d157872983d209eff5265b SHA-256: 6338db53cca2c58aeb3bf57296adeeae69bba47746c072f03b0abfdb7a9477ad
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body contains text that appears to be a lure, and a high-priority heuristic identified an image lure linking to an SEO redirector. The redirector URL is the primary IOC, likely leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/strik?utm_term=1992+polaris+trail+boss+250+weight PDF link annotation
    • http://openlait.pro/xawisezuu8wa.pdfIn PDF document text
    • http://idealicagocce.site/5198154753254hbv.pdfIn PDF document text
    • http://hisgohar.site/gixeraovns2.pdfIn PDF document text
    • http://republvinb.fun/votowawkeea.pdfIn PDF document text
    • http://topdouche.xyz/swann_dvr8-4575_manual_downloadph9ab.pdfIn PDF document text
    • http://gamuxiwami.getenjoyment.net/80234503651.pdfIn PDF document text
    • http://zubiki.top/polk_magnifi_mini_manuall91n9.pdfIn PDF document text
    • http://rimiripa.mypressonline.com/39291249775.pdfIn PDF document text
    • http://viewcreditscore.info/jerarquia_de_los_valores_ejemploscl120.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fisulefajow/76552122206.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/indiana_university_plagiarism_test_answers_2019_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18053a0-7c03-48a2-bd00-d09140c352e2/43278027527.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/61324083901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ef660b2-a335-4371-9bdc-b669316e7858/morning_pages_journal_size.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/how_to_connect_afterglow_ag9_headset_to_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/51086197140.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 5508 bytes
SHA-256: 5e211e78496a257fd64437aa8a2416641a817896e9e79d2bd27c3951e0f1e36a
font_01_sfnt_off00010add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 11860 bytes
SHA-256: b403caf8f28751d84ef0be790b6b75abaf79cf4db7da1502306bfa668365a7a2
font_02_sfnt_off00013323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13323 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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