Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9166e4f522ace3…

MALICIOUS

PDF

99.3 KB Created: 2021-03-03 15:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 85a09747abfa7e2612f7225031579f6a SHA-1: 0e0ecd06e9746aefb46e3bc800e795bae61f6e8e SHA-256: 8f9166e4f522ace3a68cca7b9b6e61779ffb2e0274d95695b6ca00c13c96b940
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 detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware delivery attempt. The PDF contains an embedded URI and a high-severity heuristic firing for an SEO redirector link, specifically pointing to 'https://jottigo.ru/wix?keyword=tipos+de+changos+en+mexico'. This suggests the document is designed to lure users into clicking the link, likely leading to a phishing site or a download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/wix?keyword=tipos+de+changos+en+mexico PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497075/normal_60396a99a520f.pdfIn PDF document text
    • http://makedctl.site/sevazolitatujasivuwdfv1s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_601ca7f876025.pdfIn PDF document text
    • http://itdomen.fun/cheesecake_springform_pan_temperatureu09by.pdfIn PDF document text
    • http://frontglass.xyz/46911716871ectt4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_603e6be6c914a.pdfIn PDF document text
    • http://karnaval.host/webubizerigijirit9rpmf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444655/normal_5fcef5865a2c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pebimomedunuzux.epizy.com/fuwemiwavamokulovosevomef.pdfIn PDF document text
    • http://pavebutom.epizy.com/84286764473.pdfIn PDF document text
    • http://wajutomagavugaz.epizy.com/43910354819.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/water_test_kit_for_coliform_bacteria.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/26622109492.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/1360377999.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/architectural_design_magazine_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/adjective_and_adverb_phrases_chapter_14_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/cot_report_cftc.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/38642935096.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
stream_003_off00012e1f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12E1F 6488 bytes
SHA-256: cd6db5fd6c1334bb6267016e0e24651dcb2e84a470ca6cda1478f2373b2947cc
font_01_sfnt_off0001443a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1443A 5376 bytes
SHA-256: 483f664514149f214a0f7aae43c21dbe28ab54ec6f04db461752b9ade550f784
font_02_sfnt_off00015663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15663 12184 bytes
SHA-256: cf57a75b6c459396acb8bc7877efa1380f1ceb1e83f2458915854b69884504c6

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