Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa11dc68108afa7…

MALICIOUS

PDF

73.5 KB Created: 2021-01-24 04:09:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 212d7fbbc7dd8e4b0a1bb34038d2229e SHA-1: 7ad101f32ecd1f62fe1f6b70fd4fc5ab929df715 SHA-256: 3fa11dc68108afa7b24cdcef511566248cc4a9f31f895c3342d1c783e4e54474
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for execution, and the embedded URLs are the primary attack vector, likely leading to further 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://seumenha.ru/aws?utm_term=waingels+college+sixth+form PDF link annotation
    • https://cdn.sqhk.co/pazaxefuma/ierahis/america_s_got_talent_arrow_apple.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/ghjf1ic/tower_defense_games_online_pc.pdfIn PDF document text
    • https://site-1202889.mozfiles.com/files/1202889/27436201039.pdfIn PDF document text
    • https://site-1084052.mozfiles.com/files/1084052/the_king_of_fighters_allstar.pdfIn PDF document text
    • http://puliliraforuwu.22web.org/22021049539.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/T9Iu0k9/62207289291.pdfIn PDF document text
    • https://site-1168030.mozfiles.com/files/1168030/mobile_payment_method_prepaid.pdfIn PDF document text
    • https://site-1168194.mozfiles.com/files/1168194/tic_tac_toe_emoji_game_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wabelat.epizy.com/27110163237.pdfIn PDF document text
    • http://vajekalisafemun.rf.gd/holy_bible_niv_offline_apk.pdfIn PDF document text
    • http://fanurumuge.epizy.com/nolifipata.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/maplestory_full_client.pdfIn PDF document text
    • http://malinaliwul.epizy.com/6905963121.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/bypass_frp_2019_apk.pdfIn PDF document text
    • http://dofumuligo.rf.gd/at_computer_full_form.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_off0000e213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE213 5376 bytes
SHA-256: 70196b55c5c71fe9914ecc9eeefbd664960199005128a154b976ad2d4da34ba6
font_01_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 10808 bytes
SHA-256: a37e6c24964b675ec56f12324b5b58f514cc417d94ea2c05849dc268d7159893

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