Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6f6e452c9d0920…

MALICIOUS

PDF

75.7 KB Created: 2021-03-30 00:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 933bcf59b21c629f49fcad3a75eb1e72 SHA-1: 7effa82711390f399b1603f3cc502ea548124a54 SHA-256: 2d6f6e452c9d09202a6cbb5713fab3af2f275ff05972f49cc8b1c602624e740e
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, indicated by the presence of a large number of external links, many of which point to PDF files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may instruct users to download a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://resalured.ru/wix?keyword=baby+daddy+song+ringtone+download
    • https://cdn.sqhk.co/vemetafije/iiCkjhg/dylon_colour_run_remover_reviews.pdf
    • https://nuvusutapisi.weebly.com/uploads/1/3/4/4/134460305/fumafilaxitiviz_geveriwiboxal.pdf
    • http://vannabanyavsedela.xyz/naladakuzemawopuact5s.pdf
    • https://vibisorimujeke.weebly.com/uploads/1/3/4/3/134344086/tokobavawemeje.pdf
    • http://closemaze.com/wheels_on_the_bus_song_lyricsxrrd0.pdf
    • http://powerpoint4you.ru/hazardous_waste_management_michael_d._lagregadk4eg.pdf
    • http://dehydratedoriginalgoodness.com/espaol_telesecundaria_tercer_gradotoq8n.pdf
    • https://cdn-cms.f-static.net/uploads/4405194/normal_5fe9618ee75f2.pdf
    • https://cdn.sqhk.co/fafujedajir/hjjchKV/bevujo.pdf
    • https://cdn-cms.f-static.net/uploads/4421639/normal_6026a8c6cb4f8.pdf
    • https://cdn.sqhk.co/fofotixoz/xgighqO/27605599582.pdf
    • http://koolmaxt.online/hecht_optics_4th_editionwzmy0.pdf
    • https://cdn.sqhk.co/pobijejok/9icXfvf/cash_n_go_pawn_depew_ny_14043.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_0aee7512f40c4bafaad380be96825e2d.pdf?index=true
    • https://b4e79a3f-0083-4b26-8056-4fe87fb46dfd.filesusr.com/ugd/332c1b_13a5e98c0324410aa1f56bdd28c8b769.pdf?index=true
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_64e93b1d5d714239a75cb36f7b4d0890.pdf?index=true
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_80587ed810504eb99395a92314d8985e.pdf?index=true
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_566407eabd7a4d04aa7820ad119618d8.pdf?index=true
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_e8ff3b0ed6dc40a78c0be1558a5b41ff.pdf?index=true
    • https://0c43c058-97b3-435a-b041-a9f001bfa883.filesusr.com/ugd/791d74_3ad98943070e4d4f8df537e3ee0693cc.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_off0000eaf8.bin
3446c110d938c46212760bc991ac1b12403851ef5aa3e734ccce60837d17a9f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 5376 bytes
font_01_sfnt_off0000fd62.bin
d83a1cc20b318804aed7cf876ecd9c519c239e1e2899645fb93228c3920bc258		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 10508 bytes

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