Malicious PDF — malware analysis report

Heuristics 6

• 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.
• PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
  PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
• LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
  Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
• 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 http://michaudwellness.com/uploads/1/3/0/4/130476944/130476944.html#albeniz+asturias+sheet+music+piano PDF link annotation

  • http://freshairnutrition.com/uploads/1/3/1/4/131406286/tofekipojudutonub.pdfIn PDF document text
  • http://camerasandchocolatesphotography.com/uploads/1/3/0/6/130621871/vudawetixeminiweguvu.pdfIn PDF document text
  • http://gpsarchibull2016.com/uploads/1/3/0/6/130640139/4001406.pdfIn PDF document text
  • http://pebbleandnest.com/uploads/1/3/1/0/131070442/bugaganupa_tazesufedor_sozivaso.pdfIn PDF document text
  • https://musescore.1000000000000000055511151231257827021181583404541015625In PDF document text
  • https://musescoreIn PDF document text
  • https://musescore.1In PDF document text
  • https://musescore.jpgIn PDF document text
  • https://musescore.mp3?revision=1430552154&no-cache=1587159843In PDF document text
  • https://musescore.040000000000000000832667268468867405317723751068115234375In PDF document text
  • https://musescore.netIn PDF document text
  • https://musescore.item-list:last-childIn PDF document text
  • https://musescore.1000000000000000055511151231257827021181583404541015625},{In PDF document text
  • https://musescore.ultimate-In PDF document text
  • https://musescore.jpg@150x150In PDF document text
  • https://musescore.png@500x660?no-In PDF document text
  • https://musescore.com\rTheIn PDF document text
  • http://www.latinosandtech.berkeley.edu/uploads/1/3/0/6/130604162/4318962.pdfIn PDF document text
  • https://musescore.com/user/21585386\rSupportIn PDF document text
  • https://musescore.com/static/musescore/scoredata/gen/1/5/8/833851/b7eced6a7f0cf6dbd020752e9580cf0a4528d1a3/scoreIn PDF document text
  • https://musescore.com/score/stats/delayed-view?score_id=833851In PDF document text
  • https://musescore.com/artist/albeniz_isaac-In PDF document text
  • https://musescore.com/static/musescore/scoredata/gen/1/5/8/833851/b7eced6a7f0cf6dbd020752e9580cf0a4528d1a3/score.com/user/1155581/scores/833851/embedIn PDF document text
  • https://musescore.com/song/suite_espanola_no1_op47-2557In PDF document text
  • https://musescore.com/static/musescore/userdata/cover/e/2/e/1155581.comIn PDF document text
  • https://musescore.com/ug/In PDF document text
  • https://musescore.youtube.com/score/stats/viewIn PDF document text
  • https://musescore.com/user/1155581/scores/833851In PDF document text
  • https://musescore.com/user/1155581In PDF document text
  • https://musescore.com/static/musescore/scoredata/gen/1/5/8/833851/b7eced6a7f0cf6dbd020752e9580cf0a4528d1a3/space.musescore.png@300x420?no-cache=1579697172&bgclr=ffffffIn PDF document text
  • https://musescore.com/user/21585386/scores/5634470/piano-tutorial?from=youtube_shareIn PDF document text
  • https://musescore.com/watch?v=L-42iZef7y4In 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://dejavu.sourceforge.netIn PDF document text
  • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

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