Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ecdf18419413cca…

MALICIOUS

PDF

71.7 KB Created: 2021-02-24 08:36:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 511ee472592d0275d5632bc60ce879ac SHA-1: 73575a8dcd05a448444872cb0b4a4324992e8543 SHA-256: 8ecdf18419413ccaccd47bf51f1b71e7b5f25f90cc71531d046abf0322449805
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, suggesting it is part of a link farm designed to drive traffic to potentially malicious sites. The embedded URLs and the document body, which appears to be obfuscated or corrupted, do not provide specific instructions but the overall structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=find+the+missing+number+puzzles+with+answers
    • http://idslim-italia.site/logo_quiz_level_40_answersvw7yk.pdf
    • https://zadidiboz.weebly.com/uploads/1/3/5/2/135295834/vojejefinuxi.pdf
    • https://cdn.sqhk.co/wanoziku/a5ihjfS/6975578961.pdf
    • http://robertferrell.net/cambridge_igcse_geography_coursebook_answersuxktm.pdf
    • https://cdn.sqhk.co/merodobiweve/1NxhhjT/55794662478.pdf
    • https://cdn.sqhk.co/vixuwegijelo/dCidjh4/tie_dye_shirt_patterns_with_pictures.pdf
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/d40c7.pdf
    • https://xijeruwenuvu.weebly.com/uploads/1/3/4/0/134018409/fepoxowigebiliziwib.pdf
    • http://datab.vip/gunobatowizhf0l9.pdf
    • https://cdn.sqhk.co/libobivole/aigUXje/vakokiperudaredavaxojir.pdf
    • http://frontglass.xyz/ayyappa_telugu_songs_by_yesudas56c95.pdf
    • http://chempion.coffee/dowokajwxlbx.pdf
    • https://gofuzuxelizexo.weebly.com/uploads/1/3/5/3/135391542/vidatake.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kawotexulozax/saxedufup.pdf
    • https://s3.amazonaws.com/nonipesikiri/agriculture_land_images_free.pdf
    • https://s3.amazonaws.com/fixararololu/transformers_optimus_prime_wiki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce70.bin
309f45561004cd724c9e1539031eca6e518fb02afd61b8026607ed17046c5189		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE70 5384 bytes
font_01_sfnt_off0000e095.bin
08fcd25a2e77450a60c343382cdd3dff26ab4848b5b2e97a36beec386e99f9c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 10172 bytes
font_02_sfnt_off00010369.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 4324 bytes

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