Malicious PDF — malware analysis report

Static analysis result for SHA-256 351d241544ec917b…

MALICIOUS

PDF

83.7 KB Created: 2021-03-21 07:06:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9d88a9234b8d95f12d539e0c25b58959 SHA-1: 9c0c4cf29acd6d4a1b6dd86ebf5dc1221cd67297 SHA-256: 351d241544ec917ba43ee8b8fc4c51a0756766f5612ab5a420a143fffcd9edcf
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://maypoin.ru/wix?keyword=5-6+parallel+and+perpendicular+lines PDF link annotation
    • http://kiwenalod.medianewsonline.com/baledowotilosibaxota.pdfIn PDF document text
    • https://cdn.sqhk.co/fezavomol/pU6QLhi/sugajulakatusu.pdfIn PDF document text
    • https://kusuxifitumaka.weebly.com/uploads/1/3/4/5/134593182/6471831.pdfIn PDF document text
    • https://cdn.sqhk.co/joxipadij/bP8hdZi/car_mechanic_simulator_game_play_online.pdfIn PDF document text
    • http://lojuxaga.mywebcommunity.org/anemia_falciforme_sintomas.pdfIn PDF document text
    • http://nubuxeki.scienceontheweb.net/anatomy_for_sculptors_understanding_the_human_figure_ebook.pdfIn PDF document text
    • https://verulezame.weebly.com/uploads/1/3/0/8/130814285/mukimil.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxugaveg/gdAQhgL/35886594347.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaluwozez/hhZHvje/vuwiwavogupefudubabub.pdfIn PDF document text
    • https://sipovabamekejo.weebly.com/uploads/1/3/5/3/135391609/2d5312f91bb.pdfIn PDF document text
    • http://kalowodopole.mygamesonline.org/11496882290.pdfIn PDF document text
    • https://cdn.sqhk.co/domojegibuze/djhjaad/strategy_pattern_java_real_world_example.pdfIn PDF document text
    • https://zawuziwoju.weebly.com/uploads/1/3/1/6/131636930/vutop-nibezevaboliti-milolavim.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/53904563308.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wujixus/kobugugizovapuligivamipip.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/55750174237.pdfIn PDF document text
    • http://dotopaku.atwebpages.com/catalogo_boxito_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/gitefirixa.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/80212375005.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/dawinoruwiwaliwufofevo.pdfIn PDF document text
    • http://sarutufasiko.atwebpages.com/roxizobopewuribezapovugov.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/95819181902.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/biputimodipebidininenezev.pdfIn PDF document text
    • http://tipokeviti.atwebpages.com/crazy_color_creatures.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/zekutelifakelozisamavukod.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/how_to_make_production_process_flow_chart.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 5280 bytes
SHA-256: 7b8a573802fe3fc4cd21b6a75835b93cf1e2deeba84721e15f5d17423d909cdd
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 11340 bytes
SHA-256: 1e693219ed7fb33a940cc7d32900050509652ca289d51d6fa4f88a67ad2a48d1
font_02_sfnt_off00012b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B96 16144 bytes
SHA-256: e2745c29a16a1f820a8f00a2b919ece60547bc1be2d312752f0859095154d3f1

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