Malicious PDF — malware analysis report

Static analysis result for SHA-256 788bc3a2348c8eae…

MALICIOUS

PDF

87.6 KB Created: 2021-03-30 14:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ac664910fe31b1e2fbf782bdcd2ae9a SHA-1: 7d745057d5ab323b4b1e822424c4b7d12ea84883 SHA-256: 788bc3a2348c8eaea5ba18362795df4f35d15f2d4221c58ec62375414b24744e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM indicates a mass of external PDF links, and PDF_URI points to a specific suspicious URL. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/award?keyword=o+positive+blood+type+diet+meal+plan+pdf
    • http://nusoxex.iblogger.org/96252402010.pdf
    • https://cdn-cms.f-static.net/uploads/4413243/normal_604197a148241.pdf
    • http://rululidevasuv.22web.org/como_colocar_assinatura_digital_em_arquivo.pdf
    • http://normaa-id.com/1497947735097sjy.pdf
    • http://wersita.space/66744526901x9uip.pdf
    • https://static.s123-cdn-static.com/uploads/4386073/normal_6006e3343c04c.pdf
    • http://gupirod.iblogger.org/chemistry_notes_for_class_10_federal_board.pdf
    • http://registrat.space/prayer_rain_dr_daniel_olukoyahfuvw.pdf
    • https://cdn-cms.f-static.net/uploads/4406241/normal_6023f720c506b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mafavuzenoliki/how_do_i_clean_cast_iron_grill_grates.pdf
    • http://bojonovaja.rf.gd/wetusaxajusit.pdf
    • https://s3.amazonaws.com/radubozufiwo/dazotenuzabe.pdf
    • https://s3.amazonaws.com/dazifozixawus/wibidolenasabewa.pdf
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_8c5949fb239b4983bafe1e5b3c3ccc14.pdf?index=true
    • http://gejajute.epizy.com/what_is_the_meaning_of_mental_power.pdf
    • https://s3.amazonaws.com/desenaz/wijuwulejiti.pdf
    • https://s3.amazonaws.com/nojemi/how_to_quit_alcohol_without_withdrawal.pdf
    • https://s3.amazonaws.com/sisaxu/vehicle_information_by_chassis_number_in_india.pdf
    • https://s3.amazonaws.com/fodose/chargesheet_movie_songs.pdf
    • https://79d8ee67-2172-45f8-9737-086b37aa5bdf.filesusr.com/ugd/2ab2ae_f97a874e71734bb4a8833bf928d9c084.pdf?index=true
    • 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_off000119d8.bin
b9131baa498795e3af5247ac14c99f90f387fbfcde6b3d53332708eae7dfe172		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119D8 5420 bytes
font_01_sfnt_off00012c37.bin
ded68ce1a6cd42a63e8cf7f4e4fee750fa615fbd2cad53f2d7397e659c906c1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C37 10796 bytes

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