Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc2f54c6c8ac5ef…

MALICIOUS

PDF

83.7 KB Created: 2021-02-21 11:10:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b3b6e7db2013b71716622145e421f241 SHA-1: 77c9b40784ee81d146fe1f953733db75190e7a56 SHA-256: 3cc2f54c6c8ac5ef61996f88e7dcc613a8be2b23deb9854c88317c0dbe739845
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially untrusted hosting, suggesting an attempt to distribute malware or phish for credentials. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a malicious intent to redirect the user to a compromised site.

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
  • 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://bologen.ru/strik?utm_term=regular+and+irregular+verbs+list+german PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444850/normal_5fe464b9a9a53.pdfIn PDF document text
    • http://rmk4sale.xyz/2444795773469p77.pdfIn PDF document text
    • http://gujafitixa.iblogger.org/android_development_tools_adt_eclipse_plugin.pdfIn PDF document text
    • http://lasleymarkt.ru/716121140139y83g.pdfIn PDF document text
    • http://malespw.xyz/libre_prestation_de_service36aqa.pdfIn PDF document text
    • http://denizan.com/israel_in_the_wildernessxigo4.pdfIn PDF document text
    • http://kefojixesopu.66ghz.com/30196450200.pdfIn PDF document text
    • http://golosa-spasibo.ru/54765712007jqk6g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_6019a1d8a16fa.pdfIn PDF document text
    • http://reawolt.online/a_thousand_splendid_suns_sparknotes_part_2wae9b.pdfIn PDF document text
    • http://keto-s1.com/wedikefuwujipofobajukaveel.pdfIn PDF document text
    • http://opit.space/34540033387fw28g.pdfIn PDF document text
    • https://cdn.sqhk.co/bamopilu/9jsigdA/ludo_lefebvre_omelet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452217/normal_5fe56ef71322d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jawikaginixuxuz.rf.gd/20362884187.pdfIn PDF document text
    • http://fositelorefux.epizy.com/regabenevixode.pdfIn PDF document text
    • http://satekivu.rf.gd/vita_di_galileo_b_brecht.pdfIn PDF document text
    • http://fagufobukabovu.epizy.com/67959530318.pdfIn PDF document text
    • http://dusetelonuzaj.epizy.com/99114690823.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011cd3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11CD3 21272 bytes
SHA-256: bc138cf4b28a21ab175191b70afef108b2218a5ae0e112680191539940d85f0b
font_00_sfnt_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 5352 bytes
SHA-256: 29c9de27bb732a1774010bd8454d4fee0cf8902a3d58a37e5620faa216cbf0a1
font_01_sfnt_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 11140 bytes
SHA-256: 2ef4d88aa1e20513d827f5e529525acaed7e00922aee918c20831351d5187b40

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