Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d9c7af84c3d92b…

MALICIOUS

PDF

78.1 KB Created: 2021-02-16 07:08:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f4079074d6fbb8a8c12b789318e21bdc SHA-1: 32bbc616e60e8bdb9884f8a0ad9ea56c7953de21 SHA-256: 28d9c7af84c3d92b544a06fffd7cee3c7d6241d942d98e4822dc00de9e134199
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are on disposable or suspicious domains, designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains keywords related to popular media, suggesting a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://jacksth.ru/strik?utm_term=christmas+with+a+prince+becoming+royal+full+movie+youtube PDF link annotation
    • http://gratoraama.space/miscreated_interactive_mapkmkku.pdfIn PDF document text
    • https://patawera.weebly.com/uploads/1/3/4/1/134131312/kibanib.pdfIn PDF document text
    • https://kudowelevuk.weebly.com/uploads/1/3/4/5/134585456/nubazejuwugikobe.pdfIn PDF document text
    • http://avtovishki-msk.ru/juzojefenaxejimekubusivpir5p.pdfIn PDF document text
    • https://miduginoxem.weebly.com/uploads/1/3/4/8/134892771/1327398.pdfIn PDF document text
    • http://padlamadla.site/debrider_baofeng_uv-_5rveftl.pdfIn PDF document text
    • https://dexajuvado.weebly.com/uploads/1/3/4/4/134470202/rizesig.pdfIn PDF document text
    • http://firstsecu-paypal.com/fopajurunoluno81f1q.pdfIn PDF document text
    • http://voirlo.xyz/ximogelatejimuwobebexezed7pw1s.pdfIn PDF document text
    • https://mebotorafegamor.weebly.com/uploads/1/3/0/7/130739377/popan-xegola-dekodovemoposaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekemifapujev.rf.gd/94978052423.pdfIn PDF document text
    • http://bozudob.epizy.com/botafogo_praia_shopping_loja_informatica.pdfIn PDF document text
    • http://riremeg.rf.gd/broadsheet_and_tabloid_newspapers_differences.pdfIn PDF document text
    • http://risumipekalur.rf.gd/38060885189.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/zovafubaxotej.pdfIn PDF document text
    • http://fofifalog.rf.gd/gunuwofizipo.pdfIn PDF document text
    • http://guwitus.epizy.com/asian_history_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/android_sdk_tools_unity_hub.pdfIn PDF document text
    • http://reditab.epizy.com/tobojamebadoz.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/how_many_lives_can_a_person_live.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_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 5728 bytes
SHA-256: 7e27c41af49bc926a7fac57d329d7551b2e5e2a511f1ee10fef9a097f28a33db
font_01_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 10356 bytes
SHA-256: b87e17a2dcd811d7b9d7528b091de5f78043a59de544d347da1a36ac8514b16f

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