Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcea4bf75bfc75c…

MALICIOUS

PDF

80.3 KB Created: 2021-05-15 01:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6208b21b7f39ae420aa95710fad47dfc SHA-1: efe1a31e90becf18c742765aa188f6b68b5149e0 SHA-256: 8fcea4bf75bfc75cd779ef8d598b2b01b8623c7c2cdff34bb598fb49e76cc826
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. ClamAV detection and ML classification further support its malicious nature. While no scripts were extracted, the presence of multiple suspicious URLs suggests a phishing or malware distribution campaign.

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://vilenefex.ru/strik?utm_term=how+many+miracles+jesus+did+in+the+bible PDF link annotation
    • http://wivikaxebox.medianewsonline.com/78053274090.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/rivezuvagoweriz.pdfIn PDF document text
    • http://xepuxesadara.mypressonline.com/ms_access_vba_programming.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_603b5e7428a73.pdfIn PDF document text
    • http://gasurorir.sportsontheweb.net/luvusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470825/normal_601a99da06e1d.pdfIn PDF document text
    • http://guparob.mywebcommunity.org/kajokupunajezip.pdfIn PDF document text
    • http://jodekemawa.22web.org/43505848368.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403264/normal_5ffa0a4aee76e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://noderisaxe.rf.gd/chitta_new_song_video_hd.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/bipolar_transistor_cookbook.pdfIn PDF document text
    • http://dumizalu.epizy.com/approximation_for_bank_po.pdfIn PDF document text
    • http://xewenofos.epizy.com/twitter_profile_picture_full_size.pdfIn PDF document text
    • http://muvamubas.atwebpages.com/povokobaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03930aa-2296-40f3-9932-ac87c3d421cc/jajufizaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2ea4cfd-b638-42c8-9860-029d86cbb4f6/english_books_for_beginners_with_audio.pdfIn PDF document text
    • http://puxalalofevan.rf.gd/60893365166.pdfIn PDF document text
    • http://bujijawuta.atwebpages.com/tinarajomo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 5432 bytes
SHA-256: c3c052fbadbdd5f47d5bdd7dcf454255997ca3e220004dd8ae51c6fd6832e97b
font_01_sfnt_off00010045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 11036 bytes
SHA-256: 3e6de39603ad1c1726d15d23fb6752943435522e0187c00ec4d97f94c9f66f2f
font_02_sfnt_off000125bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BD 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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