Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cb893660aade22…

MALICIOUS

PDF

75.6 KB Created: 2021-03-22 10:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32b8cfa04f99ba672a6f11628be69df2 SHA-1: 9f91981876d90e6dfc6f971f218d352d6c07a849 SHA-256: a4cb893660aade2227570c8af752974a2e7628923f01a7cd92d62834fb1ba1b8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, suggests a lure related to text conversion, while the heuristics reveal a large number of external PDF links, indicative of a link farm or a method to distribute further malicious content. The presence of embedded URLs and the overall structure strongly suggest this file is part of a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=arabic+text+pdf+to+word+converter+online
    • http://ruroraratotu.66ghz.com/tarot_card_reading_book.pdf
    • https://cdn-cms.f-static.net/uploads/4415756/normal_6046ef6286e2e.pdf
    • https://cdn-cms.f-static.net/uploads/4450507/normal_601daa6cb2e5f.pdf
    • https://cdn-cms.f-static.net/uploads/4409244/normal_6009b7eb1037d.pdf
    • https://cdn-cms.f-static.net/uploads/4367950/normal_604d00c3b5e59.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rasupaxuxogip.epizy.com/buen_inicio_de_ao_escolar_2019.pdf
    • http://gazugitub.epizy.com/87402400754.pdf
    • http://vubimefiz.epizy.com/terujezujafadepisig.pdf
    • http://tituroxir.rf.gd/life_and_death_twilight_reimagined_free_download.pdf
    • https://s3.amazonaws.com/potamotaz/27405023908.pdf
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_faeb4f1af54e4bf4ac2a75f77c1969ab.pdf?index=true
    • https://s3.amazonaws.com/kitakilesa/88904641615.pdf
    • https://s3.amazonaws.com/wokesabisevo/34829110477.pdf
    • https://s3.amazonaws.com/rezugekolaba/dell_optiplex_9010_core_i7_specs.pdf
    • https://s3.amazonaws.com/pexodugosa/47385840784.pdf
    • https://s3.amazonaws.com/zewimu/tasulu.pdf
    • http://zigimavabixexib.epizy.com/sea_doo_owners_forum.pdf
    • http://mibexalaxesu.epizy.com/bowibawububeradiladatidis.pdf
    • https://s3.amazonaws.com/sulasatevirexo/afinidades_eletivas.pdf
    • https://s3.amazonaws.com/wapabefizosumi/adblock_chrome_tablet_android.pdf
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_eb515d48232540c8b89d188deb587a27.pdf?index=true
    • https://s3.amazonaws.com/dalava/bojebenozudi.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_off0000ea04.bin
24379d02a9138372d669f6abd1227c956a18e60b3f7d3f23d8feba9fc455666c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 5320 bytes
font_01_sfnt_off0000fc43.bin
3871674c1649ddc0e1455a059d5589e026a588695567cc9a1f68c33318f5e49b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 10820 bytes

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