Malicious PDF — malware analysis report

Static analysis result for SHA-256 df00d8898e666139…

MALICIOUS

PDF

79.4 KB Created: 2020-12-11 19:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa3f0969b3f99362d47c76ce6c0621bd SHA-1: 6de5835f314adeea0149540b0fe25b178f9032dc SHA-256: df00d8898e666139d55c60be754a9204b6a22b828f803cefac9eb91c708f8c94
164 Risk Score

Malware Insights

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

The PDF contains a lure for 'Classworks student login' and embeds numerous external links, with one suspicious URL pointing to 'trafficel.ru'. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or redirection strategy. ClamAV detection and ML classification confirm its malicious nature, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafficel.ru/123?utm_term=classworks+student+login
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/samesuseliju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6a2ef8ef-e604-4d71-8994-5efeb9d1c9b3/jexegebimim.pdf
    • https://s3.amazonaws.com/luresimosip/badger_airbrush_compressor_regulator.pdf
    • https://static1.squarespace.com/static/5fc347c00a2757459bf24eac/t/5fcbfd4b0ab5d62febdce28b/1607204172172/barixogamik.pdf
    • https://uploads.strikinglycdn.com/files/dc8cdbb3-3157-4ded-9940-ec75b5e3f0be/teruvudaje.pdf
    • https://static1.squarespace.com/static/5fc0e5b8a3bf4b14aba92f9c/t/5fc1aa453c6ccf69f39caccd/1606527560561/25501064795.pdf
    • https://uploads.strikinglycdn.com/files/201aaad4-5cd2-46a4-9dc5-be11840793a0/woposafozabewuwu.pdf
    • https://uploads.strikinglycdn.com/files/a2d98b79-3c02-41e2-a27b-b53f816dbfdd/packing_foam_sheets_uk.pdf
    • https://static1.squarespace.com/static/5fc585359698b02c7f3ffd29/t/5fc8db2fdcb5b26079860fae/1606998832631/lupumotoganozisudinege.pdf
    • https://uploads.strikinglycdn.com/files/f70ff127-5660-43df-a59f-aec1b2f6dd43/mesiribojosanirir.pdf
    • https://s3.amazonaws.com/vukusa/46773720935.pdf
    • https://s3.amazonaws.com/xoguwavosuje/36827948105.pdf
    • https://s3.amazonaws.com/godewumazek/41250057933.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c303.bin
a379eaa1a9260b59b458a6ba0e142d1284e028e1245fdc5b60f8b84ba646d4d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC303 8940 bytes
font_01_sfnt_off0000e127.bin
b79b8881982edfb780546938597368ae6e013ded23d330804ef64369b011d965		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 5052 bytes
font_02_sfnt_off0000f274.bin
f95cfee64dbfbeacf59413bec5231d189f74b61711ee640d3734d09a4c6fcb79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 11712 bytes
font_03_sfnt_off00011a7d.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7D 16204 bytes

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