Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15cfce7c5704b11…

MALICIOUS

PDF

92.5 KB Created: 2021-02-19 14:54:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 072466f194ea3c165ebe8b0d1036d020 SHA-1: 9f238636da061a728221322c5a92b1b03d11805a SHA-256: e15cfce7c5704b1119e745adf9b564563346caf97041dc894ba11733f4c5373a
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many pointing to disposable domains and redirectors, indicating a link farm designed to lead users to malicious content. The heuristic firings, particularly 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM', strongly support this assessment. The ClamAV detection and ML classifier further confirm the malicious nature of the file, likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=oshenwatch+smartwatch+app In PDF document text
    • https://cdn.sqhk.co/tasokuxu/Vjhjejc/hobby_lobby_near_me_open_on_sunday.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/vXibLhd/king_crusher_a_roguelike_game_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fadejiweruw/d8mNidT/66174558599.pdfIn PDF document text
    • http://formverifiedbadge.com/951811320661yxy1.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/y3jdfib/shooting_games_battle_royale.pdfIn PDF document text
    • http://educationonline.website/how_to_build_a_car_adrian_newey_free_downloado5v4w.pdfIn PDF document text
    • http://jedunoba.iblogger.org/learn_quran_online_free_english.pdfIn PDF document text
    • http://axecheat7.xyz/49799825648yz2z2.pdfIn PDF document text
    • https://gogadumipoti.weebly.com/uploads/1/3/1/0/131070618/f3101af898.pdfIn PDF document text
    • https://toxosujaduwo.weebly.com/uploads/1/3/0/8/130874389/6881874.pdfIn PDF document text
    • https://birivuben.weebly.com/uploads/1/3/4/6/134618962/2826523.pdfIn PDF document text
    • http://vbruti.site/boss_kannada_movie_songstf8of.pdfIn PDF document text
    • http://amsidgi.xyz/37506189320jlrxd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/riwadexalojifopozet.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/scanf_whitespace_format_string.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/38784086407.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/roximunifor.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E54 5260 bytes
SHA-256: bc5111fc5b3b473c7401617d180df451e03c04697e4bc0942756d15656bddaa2
font_01_sfnt_off0001401d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401D 10804 bytes
SHA-256: 52f690f7af461c6cfb286e4541a35f63d1ee8e5d8c52735e7d937d4bc3499033

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