Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5d3c5a3f67ea2e…

MALICIOUS

PDF

66.4 KB Created: 2021-02-09 12:23:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 5c1313525eaf8839a6c11c03780f80bf SHA-1: ef2ffabfb20aabc96776d1a49edd6fc66ab9685e SHA-256: ae5d3c5a3f67ea2e5548e2151f465c24bc26737952e9fda30a18a32ded880382
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it likely serves as a phishing lure or malware distribution vector. It contains a large number of external links, many pointing to disposable hosting or redirector infrastructure, suggesting an attempt to obfuscate the final malicious destination. The presence of a 'download button' lure further supports a malicious intent to trick the user into clicking a link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=aliner+ranger+12+owner%2527+s+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_5fd2ceff1a4d8.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/iipjghh/70344994197.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/iijAuie/24226898297.pdfIn PDF document text
    • https://widosogepe.weebly.com/uploads/1/3/3/9/133986955/fitovemogabe.pdfIn PDF document text
    • https://sezebotari.weebly.com/uploads/1/3/1/6/131636698/zutorefogolujak-gumutogaxapa-putogofoluvo.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/pSe3jaL/the_lightning_thief_movie_grover.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/rtgjwia/hueys_menu.pdfIn PDF document text
    • http://biweekamnf.com/infectonator_3_free_download_androidxdzuf.pdfIn PDF document text
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/xotekolezala.pdfIn PDF document text
    • https://jaduvobawitirok.weebly.com/uploads/1/3/4/3/134398576/kaduti.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/jzjiohe/idle_zombie_defence_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495684/normal_6017c066e6c72.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/jdnhfTl/sanemivuwutili.pdfIn PDF document text
    • https://zisediri.weebly.com/uploads/1/3/1/4/131411341/238cec108.pdfIn PDF document text
    • http://homebig.space/gamujulufabipuwwhgex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464534/normal_5ff43ad0d2ae4.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/gomaxod/titazurowis.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/johnny_b_goode_sheet_music_scribd.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/ponokesevosukisebuvakase.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/fourier_series_and_boundary_value_problem.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_off0000c6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FE 5304 bytes
SHA-256: 027820574fa43cf8686c09f111fe135a881e0a4c8cb6dbafe912b39964546751
font_01_sfnt_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 10268 bytes
SHA-256: 4458ed296e772949684674e2c528fef1a3d68d5aaccb8f34e9afd0c4f24343cd

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