Malicious PDF — malware analysis report

Static analysis result for SHA-256 2476bb046fcc93cc…

MALICIOUS

PDF

99.9 KB Created: 2021-03-14 20:38:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7716147ffffb384c35984d07ab9b3fe1 SHA-1: e94cec9d40816bc1f6339c3c607602dabf7c1117 SHA-256: 2476bb046fcc93cc8a0319a0864ae9bb73f782f4cac275697dc40e4815b4ea51
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a 'welcome letter', which is a common social engineering tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/wix?keyword=welcome+letter+to+parents+from+teacher+2020 In PDF document text
    • http://forexgeeks.net/23382208672ev4fi.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/ij47Ghh/pakistani_imli_chutney_recipe.pdfIn PDF document text
    • http://salea.site/zazanarunonaxifepewaxunl9rt.pdfIn PDF document text
    • http://fit-italy.space/makanalolazokarenujfq0p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393511/normal_5fccadcb291f8.pdfIn PDF document text
    • http://golosa-spasibo.ru/lugimarututioffan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_603d7ff835e1b.pdfIn PDF document text
    • http://denizan.com/raze_3_hacked0b68h.pdfIn PDF document text
    • http://chestlune.online/5633496154503e6d.pdfIn PDF document text
    • http://alcexpress1.xyz/284756913997oixx.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/igtYhbs/wilovevakuruner.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446512/normal_602ebf817dc28.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/voltaires_candide_satirizes_the_idea_thati58ha.pdfIn PDF document text
    • http://parkingtest.xyz/yamaha_yas_203_remote_learn1ewr2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485313/normal_5fc9a9ede2575.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406223/normal_6005a42dbee34.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/panalipolifod/wolonijevevof.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/bitilalurulipiwiji.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/adjectives_year_5_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/android_api_level_distribution.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_off0001498d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498D 5540 bytes
SHA-256: 08655b4ae4243b0ab0d9f9f943e9fb78d23a65cab7efc50a5065ea8324854086
font_01_sfnt_off00015c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C45 10272 bytes
SHA-256: d10cd08400fc6f855bd8e1a378ae72eddb181f4ca0d044e7b58eea77159d3bf0

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