Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b27b3d4125e711…

MALICIOUS

PDF

72.6 KB Created: 2021-02-21 06:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 10e15ae7eba0c8511d7f63d2fea7d4ee SHA-1: 52fe0b09df75c896ebaf8db9dadbcc3025a0728d SHA-256: e9b27b3d4125e711597df80442f0f525f2ff45a654a003b9a06150430bea3751
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external links, with one prominent URL pointing to a link farm hosted on disposable infrastructure. The document body, though heavily obfuscated, contains text related to English verbs and pronunciation, possibly as a lure. No scripts were extracted, but the presence of multiple external links suggests an attempt to redirect the user to malicious content.

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
  • 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://baarspo.ru/123?utm_term=100+verbos+mas+usados+en+ingles+con+pronunciacion PDF link annotation
    • http://lnstagramverifiedsbadgesforms.com/amazon_stock_todayl196v.pdfIn PDF document text
    • https://cdn.sqhk.co/tamurikubol/jfMwUjd/hay_day_hacks_that_work.pdfIn PDF document text
    • http://remontlegko.info/smadav_antivirus_2017_for_windows_70t03p.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/hhgijew/oh_god_you_are_my_god_scripture.pdfIn PDF document text
    • http://reactivaperu-2020.com/gujepolinotidivefizp54cp.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/a1odARI/31384425212.pdfIn PDF document text
    • https://cdn.sqhk.co/kelulegawi/jcphLNR/handelsblatt_push_nachrichten.pdfIn PDF document text
    • https://cdn.sqhk.co/dagufiwus/7Vhhghc/free_game_recording_software_for_windows.pdfIn PDF document text
    • http://site-shop.xyz/bidogeroboretejodzjq8f.pdfIn PDF document text
    • http://buytoday.cc/count_on_me_ukulele_chord_guideg8dw9.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/jhiiicH/20386355245.pdfIn PDF document text
    • https://cdn.sqhk.co/tevimuwijile/Pgighp0/47185679174.pdfIn PDF document text
    • http://susurrus.space/5133639584859nhi.pdfIn PDF document text
    • http://grigolia-studio.ru/gigivixenixixalatipabuka3ggxe.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/bulikowexunepov/alphabet_phontique_pompier.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/gezebiwogakudakopaxavu.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/99383310169.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_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 5692 bytes
SHA-256: 42b8192a7addef829a202a985702cb474da91aae5f06c93a86b498ed657f9fbc
font_01_sfnt_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 11076 bytes
SHA-256: 28825e69f04974072c3527dae12a46f9c284c8c007632e6f81980c64596270aa

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