Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b92f3cca4bdf20…

MALICIOUS

PDF

91.6 KB Created: 2021-03-25 08:57:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9de1b8603951304245afa1249669fe3 SHA-1: 41b1ac607f1c54d8991911fb9e0b28c6ebeb25c9 SHA-256: 19b92f3cca4bdf20d7b85a005bdf307fccdd8863532a0de8253b12c08c148db6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or redirecting users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting an attempt to create a link farm for SEO manipulation or to host malware. The ClamAV detection and ML classifier further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous external URIs strongly suggest it's designed to lead users to compromised or malicious content.

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-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://ponafet.ru/wix?keyword=holt+spanish+1+expresate+answer+key
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/4020976.pdf
    • https://zinadilijisud.weebly.com/uploads/1/3/4/6/134619113/negamapunoxugo_putogugujunumo.pdf
    • http://wugegifa.getenjoyment.net/2047989956.pdf
    • https://sujolatako.weebly.com/uploads/1/3/4/6/134624807/6538234.pdf
    • https://dawifibikinofi.weebly.com/uploads/1/3/4/6/134682228/rigeparo.pdf
    • http://xupulakikovuxo.mypressonline.com/rainbow_fish_display_tank_youtube.pdf
    • https://nezijolumuka.weebly.com/uploads/1/3/4/0/134016970/putilavika_nezob_gozulew_fekodaz.pdf
    • https://vowabogebem.weebly.com/uploads/1/3/0/7/130775978/wimupivutizif.pdf
    • http://deseputageb.iblogger.org/flat_stanley_books_to_read_online_for_free.pdf
    • https://wigewowatabosaz.weebly.com/uploads/1/3/4/3/134352056/799f577dd.pdf
    • http://kuzamejeluwezik.22web.org/gimorajozulijugipebemubun.pdf
    • http://keruluzo.medianewsonline.com/dakedimatalamij.pdf
    • http://tufodudem.mypressonline.com/baofeng_uv-5r_manuale_ita.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gotobixeg.rf.gd/pdf_file_reader_app.pdf
    • https://s3.amazonaws.com/sobaketemu/foxorebub.pdf
    • http://nomapalugaji.epizy.com/german_stories_for_beginners.pdf
    • http://wolaxagemir.rf.gd/garmin_vivofit_jr_battery_indicator.pdf
    • https://s3.amazonaws.com/dejolavubukugeb/42812178900.pdf
    • https://s3.amazonaws.com/roxawo/bootstrap_4_simple_admin_template_free.pdf
    • http://lugivodunoxasi.atwebpages.com/75443611402.pdf
    • https://s3.amazonaws.com/sukedil/nano_loco_m2_datasheet.pdf
    • https://s3.amazonaws.com/pazerogasarinu/6589749799.pdf
    • https://s3.amazonaws.com/sezebepit/basawejivaxafa.pdf
    • https://s3.amazonaws.com/fokapikow/bass_synth_wah_digitech_manual.pdf
    • https://s3.amazonaws.com/gumegulaxi/how_to_pair_marley_headphones.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_off000125ba.bin
c0ffd65a2292d918dd1a3ca9a8fca90646821b3b3b2e0b85827e90c19c3b25b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125BA 5244 bytes
font_01_sfnt_off000137a3.bin
c1ef673d26c4c7c4857e0cffc369f05a600bc3e7158ff6037991d07ea32f4bec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137A3 12840 bytes

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