Malicious PDF — malware analysis report

Static analysis result for SHA-256 5125ebd83b255099…

MALICIOUS

PDF

79.0 KB Created: 2021-01-14 09:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36b74c3eee55eb758932cc4dcb9c9a09 SHA-1: b9385d1b9f85ffec3f9cc91262d47b9d61bc598c SHA-256: 5125ebd83b2550998fae21ffc0d4db4777e1e553230bffc303d68a303fa9458a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/123?utm_term=a+history+of+the+western+art+market+pdf'. ClamAV also detected it as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, likely serves as a lure for the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=a+history+of+the+western+art+market+pdf
    • https://cdn.sqhk.co/wevujawej/heSVhjp/benarazuzedifogegeseso.pdf
    • https://site-1174856.mozfiles.com/files/1174856/nikora.pdf
    • https://cdn.sqhk.co/vigamodijek/eibidjg/mobile_wallet_apps_android_market.pdf
    • https://cdn.sqhk.co/belexewuwif/24Dhc38/to_do_list_printable_word.pdf
    • https://cdn.sqhk.co/rifusofuwedi/jbxggic/doctor_on_demand_coupon_june_2019.pdf
    • https://cdn.sqhk.co/giganopof/ZGhbAHp/knight_of_wands_star_sign.pdf
    • https://cdn.sqhk.co/bitaxukezor/18nWBjc/zojuwug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xajowu/the_three_stooges_spooks_1953.pdf
    • https://s3.amazonaws.com/gapivegek/80890688382.pdf
    • https://s3.amazonaws.com/jasadavebaga/sevesidipaso.pdf
    • https://s3.amazonaws.com/zunaduxa/daguzerekavemobukos.pdf
    • https://s3.amazonaws.com/lixuduwonifa/jquery_ajax_zip_file.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_off0000f393.bin
b7b3c3f9daead6425248db3b39e8072d45314a4e5c0f2a478c1b7cd6c3e076e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 5496 bytes
font_01_sfnt_off00010633.bin
97c88e92995063f3a4804320b97b2c157cf8940baaf40fe2568cc0a1941c7b78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 13164 bytes

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