Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64544871c73f101…

MALICIOUS

PDF

78.3 KB Created: 2021-03-02 08:50:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 60a4455e69b57e230afb684d1488aad6 SHA-1: aee2d47eaeb3fd8a403d5d2ac1f9cbb05343b07b SHA-256: d64544871c73f10145313f93407270685f6d59b3c67cc1e88899dd8b4fcc3306
184 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links that redirect to known malicious infrastructure and disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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/award?keyword=powershot+5700m+staples In PDF document text
    • http://idealslimitaly-official.site/how_much_is_lockout_serviceym71v.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/explain_how_the_3_branches_of_government_work_together.pdfIn PDF document text
    • http://walletelectrum.buzz/fotuxolomopowezojasilczgh9.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/6HCfOyw/48881995005.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/biaiehg/draw_me_close_to_you_lyrics_and_chords.pdfIn PDF document text
    • http://obzorov.site/pujuvavururejc198.pdfIn PDF document text
    • http://tryse.xyz/how_to_make_a_large_crochet_circle_into_a_squareoflms.pdfIn PDF document text
    • https://cdn.sqhk.co/wazofovam/ijhcGha/sky_glider_swing.pdfIn PDF document text
    • http://boomerangoo.site/what_is_a_good_price_for_royal_caribbean_drink_package9hr9q.pdfIn PDF document text
    • http://potuxoposutu.medianewsonline.com/32667312551.pdfIn PDF document text
    • http://mignonette.space/nitrogen_cycle_worksheet_tespq1r8.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/how_to_put_up_word_decals.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/fajeloninesitel/zivonaw.pdfIn PDF document text
    • http://kuwijiti.myartsonline.com/15768326342.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_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 5496 bytes
SHA-256: 97bd1ed10b3e6d8259509db2637f03bb2b1448f87d04ebda0479addf577a364c
font_01_sfnt_off00010869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10869 10532 bytes
SHA-256: 7527cd003b680f0806b05e0234dc1def0c63484a194db43a1776797ca363957d

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