Malicious PDF — malware analysis report

Static analysis result for SHA-256 acda5f733606f885…

MALICIOUS

PDF

85.7 KB Created: 2021-03-29 01:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 741685b5d7f3ec40b40c2f993db22002 SHA-1: 29c0433f3709ca041e1dfb13eb1ff9433114e198 SHA-256: acda5f733606f8853429efe17063269c2e3316756799429f64e80f2ad4ff9ef2
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating it's a phishing lure using an SEO redirector. The embedded URLs point to various PDF files hosted on external domains, suggesting a multi-stage download or redirection scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns designed to trick users into downloading further malicious content.

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://kuzutuzo.ru/wix?keyword=el+presente+progresivo+worksheet PDF link annotation
    • http://forovasax.medianewsonline.com/javopozevape.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/11918270858.pdfIn PDF document text
    • https://zowuxebikazusi.weebly.com/uploads/1/3/4/6/134654267/tupakomitabezat_muwubumex.pdfIn PDF document text
    • http://reawolt.online/extend_work_permit_canada_form0xqh9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_601f25fa14344.pdfIn PDF document text
    • http://ottics.ru/60774577875ws8zc.pdfIn PDF document text
    • http://malespw.xyz/how_to_use_wahl_clipper_oil8ankh.pdfIn PDF document text
    • http://zipogagu.iblogger.org/91684519765.pdfIn PDF document text
    • http://japancar-sib.ru/wurefilegabuduraja3kby8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413865/normal_5ff4cf34ef0c6.pdfIn PDF document text
    • https://wisolowiguwo.weebly.com/uploads/1/3/4/6/134630140/vatuxixu.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/tesotiwapax/didofelokuzola.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/23185095259.pdfIn PDF document text
    • http://rusiwebo.epizy.com/changing_to_word_free_software.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/85302701455.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/fajimudilizubaxaxijijor.pdfIn PDF document text
    • http://visugog.myartsonline.com/zotato.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_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 5044 bytes
SHA-256: dd33e781ef779b532324382d2bed308af69ce08ccc969818a06af15b3c05dba5
font_01_sfnt_off00011ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBE 13392 bytes
SHA-256: 07ea9c7c116a2d33bbe831b4be6de3e5698a6ddf5418b09d3d5e330c56ef6ba3

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