Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7c60c4a6d64aff…

MALICIOUS

PDF

77.8 KB Created: 2021-04-11 21:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e97f0786b579db2e78767bac9cce2f33 SHA-1: 2928e79c5c9e38442a6fbaab43867c0eb8e53cd4 SHA-256: dd7c60c4a6d64affc217823923dcc32fc5c1ed7b1434970ed69733957057df1d
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are disguised as search results or document titles, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing a secondary payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/strik?utm_term=how+to+cook+oatmeal+in+a+zojirushi+rice+cooker
    • https://cdn.sqhk.co/figegixo/bWjjghi/52753695459.pdf
    • https://gedexezesojefib.weebly.com/uploads/1/3/4/6/134666283/75757.pdf
    • https://cdn.sqhk.co/raxuzuvuluf/qijcido/25481088489.pdf
    • https://cdn.sqhk.co/velizovatim/hMphjjj/jifabujalarib.pdf
    • https://cdn.sqhk.co/revowemerem/jYij62G/knights_inn_hotel_traverse_city_mi.pdf
    • https://cdn.sqhk.co/kagaxavog/ieJhdjd/tewafor.pdf
    • https://cdn.sqhk.co/nanagajog/EfticBs/surrender_ant_killer_walmart.pdf
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.pdf
    • https://fokutape.weebly.com/uploads/1/3/2/8/132814024/9951745.pdf
    • https://cdn.sqhk.co/wikaraxixi/jbcSjfh/pajuwaw.pdf
    • https://cdn.sqhk.co/kixobaza/J23a8ie/area_of_a_circle_formula_using_diameter_calculator.pdf
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/69ba1bc90a20b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_f6aaf7b7f70c4e9f94ae277685fb6a57.pdf?index=true
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_e984fc8bd6b04c8d9be1f528014c8b43.pdf?index=true
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_d8ef44ccaa084c3cb0a5fa18c348d298.pdf?index=true
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_60aed04f8ccf4171a746d0f40d5fc096.pdf?index=true
    • https://394fded3-a37f-45fe-8092-07e0884d2d31.filesusr.com/ugd/bdbc91_cbdf8c142f0d4f32bf16e9816c96c8d1.pdf?index=true
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_c94e54ac672a42c6b0e2e3f765f480c0.pdf?index=true
    • https://s3.amazonaws.com/xipavir/raladuwatanoso.pdf
    • https://aa84fbb7-d3ea-4675-94d1-3a2d808898f4.filesusr.com/ugd/661a84_eb6f8c8cfb424437a7046d25c6ea32af.pdf?index=true
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_699f5b36c5d344e9b4f0a87d711a189a.pdf?index=true
    • https://s3.amazonaws.com/banula/renisarodizise.pdf
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_ee1386b292a949b0b32fb94057f3e16c.pdf?index=true
    • 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_off0000f221.bin
31a1fda51f373efd0e3a0b1106713201c03d336adf73ed786aaef7ffc78463a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 5280 bytes
font_01_sfnt_off00010407.bin
bae05c868b7ef58ede4a1ebfb9018780bef246e1f5735b1ec1ceccdaaf69b61f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 10972 bytes

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