Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f412db22d3788ae…

MALICIOUS

PDF

67.9 KB Created: 2021-03-19 20:37:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdea16b8bfdb59700eea4e07cc4a3005 SHA-1: 523453a667b1614915df2fec7f3dbdf5ff0102a0 SHA-256: 5f412db22d3788ae6b31ac03edddb25f8267656329eea8ee0b8840807c132e80
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=course+2+chapter+9+probability+answer+key+mcgraw-hill'. This URL is designed to lure users into clicking by impersonating educational content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests it is likely part of a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/wix?keyword=course+2+chapter+9+probability+answer+key+mcgraw-hill
    • http://poxeget.iblogger.org/32594910762.pdf
    • https://voxasofipazo.weebly.com/uploads/1/3/1/4/131407247/7276130.pdf
    • http://gufolosolikivu.22web.org/gestational_hypertension_latest_guidelines.pdf
    • https://cdn.sqhk.co/womafafowix/hdjcgdo/nowinipiniwuwuvewage.pdf
    • http://idealslimitaly-ufficiale.site/53862614660tc4f9.pdf
    • https://cdn.sqhk.co/japewaturu/ftjiarz/3082455961.pdf
    • http://spainwow.pro/patovezufatorupom93tai.pdf
    • https://nabaladeso.weebly.com/uploads/1/3/1/4/131438379/86f2f39bac4388.pdf
    • http://jujabadoko.22web.org/grade_9_poetry_unit_plan.pdf
    • https://cdn.sqhk.co/vabolepibe/ehgtrij/como_buscar_mi_android_perdido.pdf
    • https://cdn.sqhk.co/dimowitop/CcfuhbU/50460541084.pdf
    • http://dashcamtopbest.com/27486461564nrpog.pdf
    • https://cdn.sqhk.co/pulizojiwim/jb5Inib/anveshi_jain_gandi_baatein_free.pdf
    • https://filuloxi.weebly.com/uploads/1/3/2/7/132740414/6ac92.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/farowug/fojinolodilewu.pdf
    • https://s3.amazonaws.com/vabemavuputenif/elcon_charger_datasheet.pdf
    • http://bexisojulodu.epizy.com/descriptive_research_definition_by_authors_2020.pdf
    • http://zudobuzediret.rf.gd/54415647228.pdf
    • https://s3.amazonaws.com/ruzaganog/90158458557.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb9d.bin
f57b3cff3e6ee5e7430221905675241e80bab2d80b60e18f571523311631d1f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9D 5968 bytes
font_01_sfnt_off0000dfdf.bin
d42a2323d2cb65ed19711d18a78e7c3d9e65f76c273a14b9c51c8126e8c312d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 10000 bytes