Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8496124d265c9c6…

MALICIOUS

PDF

83.9 KB Created: 2021-03-23 22:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38b2e0558e3943a776d078e2361ccecb SHA-1: 45f2dcff73c6366461ba32dfa6cbc5e8d5221df8 SHA-256: e8496124d265c9c6b1773503abbff8faffc06f3ab5183284214b496e5cc9d823
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=apk+automatic+tag+editor
    • https://cdn-cms.f-static.net/uploads/4379982/normal_5fd107c4d0505.pdf
    • https://cdn-cms.f-static.net/uploads/4428083/normal_5fdbe42c6ceb2.pdf
    • https://cdn.sqhk.co/tamoravuwera/gVYigL8/2771361788.pdf
    • https://cdn-cms.f-static.net/uploads/4365542/normal_600defde0a73c.pdf
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/7064831.pdf
    • https://logekififej.weebly.com/uploads/1/3/4/5/134502341/finukobuzapeja.pdf
    • https://jikudirag.weebly.com/uploads/1/3/4/0/134040407/1498080.pdf
    • https://fuselenedirila.weebly.com/uploads/1/3/4/5/134597682/tegewuzekud.pdf
    • https://cdn.sqhk.co/rowagana/bgjm1jc/fractions_and_decimals_worksheets_kuta.pdf
    • https://volixezutepa.weebly.com/uploads/1/3/4/1/134131916/kaledij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tapelu/lefupenirutujulo.pdf
    • https://s3.amazonaws.com/satulibaren/tasazafirokasadegalag.pdf
    • https://s3.amazonaws.com/fefurorobumi/how_to_make_residual_income_2020.pdf
    • https://s3.amazonaws.com/befarekogol/uric_acid_test_lab_report.pdf
    • https://s3.amazonaws.com/suxiweke/grid_template_repeat.pdf
    • https://s3.amazonaws.com/vebenok/zaporekok.pdf
    • https://s3.amazonaws.com/xubifupi/xovelovuxumomupolexixuz.pdf
    • https://s3.amazonaws.com/wifiduxezo/45563204480.pdf
    • https://s3.amazonaws.com/dosipive/organic_chemistry_2_exams_with_answers.pdf
    • https://s3.amazonaws.com/jivagajamav/nerusafidaze.pdf
    • https://s3.amazonaws.com/babuxufarizuxur/wusegas.pdf
    • https://s3.amazonaws.com/dupula/55035971641.pdf
    • https://s3.amazonaws.com/bejideba/manual_template_indesign_free.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f612.bin
74204f6229fef71d4ac4cc870b74cab9af97b4b105e7008d2f0e3554bc55eab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 5236 bytes
font_01_sfnt_off000107cf.bin
a9981af024c56dd02367447b3c0f2d22308204468c28cb0a8c6da69879f1604e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 11028 bytes
font_02_sfnt_off00012dd3.bin
6f17b99764d671a96c0d2fd0b5f339513c2ddbf7efa5d755f63b897ad21dd613		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD3 16064 bytes

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