Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5314b19debef078…

MALICIOUS

PDF

70.0 KB Created: 2021-03-31 22:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f68ef239738b333389b6c5ed2f8332cc SHA-1: 7c7854a3ff78ed01cb3ef0cfddcad18973cc03e3 SHA-256: d5314b19debef078039a6adf1caeb268ff838f3bd5dbb9d69d69ae340abd08d9
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to redirect users to various potentially malicious sites, including 'http://xebobimifu.22web.org/wigololos.pdf'. The presence of embedded URLs further supports the attack pattern of luring users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/123?utm_term=newspaper+report+format+igcse
    • http://xebobimifu.22web.org/wigololos.pdf
    • http://futiwene.22web.org/how_to_get_youversion_bible_app.pdf
    • http://trysoda.pro/a_theory_of_human_motivation_original_1943_article_by_maslowxpey8.pdf
    • http://votutatiturapat.22web.org/fasting_every_other_day_weight_loss_results.pdf
    • http://evatopshop.xyz/what_is_the_enthalpy_of_neutralization_of_nh4oh_and_hcl_numericallye25um.pdf
    • http://mini-camera-super.club/36412003964qfx7x.pdf
    • http://xigepidi.22web.org/billy_goats_gruff_book.pdf
    • http://stonersfranchise.com/mipevaruu0tz9.pdf
    • http://babobekoru.66ghz.com/vedevobikobubojuw.pdf
    • http://foodguideblog.com/free_lds_sheet_music5k5zb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wawuzir.epizy.com/arikil_pathiye_song_ringtones.pdf
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_f91d0048b4ea4c42b5c00fa339318036.pdf?index=true
    • http://joriboka.epizy.com/four_major_branches_of_philosophy.pdf
    • https://s3.amazonaws.com/moduxanakuri/95268019827.pdf
    • http://donenufalu.rf.gd/36851854691.pdf
    • http://dajejat.rf.gd/fiszki_angielski_dla_dzieci_chomikuj.pdf
    • http://tagefurinunoja.epizy.com/magusobinofi.pdf
    • https://s3.amazonaws.com/rotowan/rigigivoja.pdf
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_ea3948f0d4b14b068801dd06cd96f4a1.pdf?index=true
    • http://wunizazug.rf.gd/aufklrung_literarische_formen.pdf
    • https://s3.amazonaws.com/takebemanijewok/lee_daniels_the_butler_movie.pdf
    • http://karedewig.epizy.com/51311709665.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2d8.bin
492afe73eef7b6a87972a689c48b9f15d6a1cfa16c1c3d671313c8cb438356de
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 5364 bytes
font_01_sfnt_off0000e51f.bin
83e804c3e936eb177e63646bc6598667a476726367855a2b4be8c886a55d67ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 10516 bytes