Malicious PDF — malware analysis report

Static analysis result for SHA-256 12114b1ece1d37c5…

MALICIOUS

PDF

70.3 KB Created: 2021-03-19 22:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03c5948e0ef628cdde543339a3966dd4 SHA-1: 2ec5b9469e540576cc75f0db961a63cf41461649 SHA-256: 12114b1ece1d37c5820a6b40449bc061fb7aa91440e2391e943677a1a5f7c833
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with numerous URLs pointing to other PDF files, indicating a likely attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive URL usage are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

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://zajinet.ru/award?keyword=ca+notary+acknowledgment+pdf
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/7272951.pdf
    • https://sosepokapebovi.weebly.com/uploads/1/3/0/8/130814645/fozominixetinipuvid.pdf
    • https://lezevonunibo.weebly.com/uploads/1/3/4/5/134577944/3875066.pdf
    • https://wewowalowumuv.weebly.com/uploads/1/3/4/0/134040384/476d138165a4d4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gojaxuga.epizy.com/sample_sales_kit_template.pdf
    • http://xusexupilaru.epizy.com/pimomuriputufugifusixokod.pdf
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_195efa8d9d14434cac861316a7877e86.pdf?index=true
    • http://zelonixen.epizy.com/majajolit.pdf
    • http://gizezusofozud.rf.gd/gifafutebaxevufadiguzu.pdf
    • http://zuzaxitiruxojax.epizy.com/xfinity_xr2_remote_not_working_with_sony_tv.pdf
    • https://uploads.strikinglycdn.com/files/c3449a92-ec2e-454d-8096-ecc11086464e/wejovekidata.pdf
    • https://uploads.strikinglycdn.com/files/a9afc560-d8b5-40c7-a40a-e00a74f0cd31/how_do_i_find_the_4_digit_code_for_my_lg_tv.pdf
    • https://uploads.strikinglycdn.com/files/f4b35724-04e7-4a9c-a38e-7b5719c0ddaa/me_before_you_review_quora.pdf
    • http://gepesosanar.rf.gd/dexibufi.pdf
    • https://uploads.strikinglycdn.com/files/8f65b088-0255-4554-8eae-e13d4ed61fdb/fibuxuk.pdf
    • http://zepumibofisi.epizy.com/rodokabaf.pdf
    • http://vavuliremu.rf.gd/english_grammar_in_use_raymond_murphy_cambridge_university.pdf
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_628741e94b4c4a83ba085e76070996e0.pdf?index=true
    • http://wujijewukexewo.rf.gd/24260683470.pdf
    • https://uploads.strikinglycdn.com/files/ba347041-c72a-424b-8498-e3532ad2854f/84465012303.pdf
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_afd83e4635c84c308ff5ce2c51dbe54b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f53fdedb-ef77-495d-bfc9-d4276afeed0a/how_to_2x2_picture_in_paint.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_off0000d483.bin
b2267552a98334bea517a1f2f99c615c3a818cf023a72c2e3ddef53711c22ce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD483 5460 bytes
font_01_sfnt_off0000e720.bin
35c102724f885543886ff50c8c72731f217be5dea8db623131df958cb09d3c4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 10696 bytes

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