Malicious PDF — malware analysis report

Static analysis result for SHA-256 efba7421b1c0eb86…

MALICIOUS

PDF

81.6 KB Created: 2021-04-08 01:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1960afe6f385d47626d9ed7d56d4c05e SHA-1: 0e4a71290a977eb46b18e83ac84879d1431afeef SHA-256: efba7421b1c0eb8664465b45a004527b5f67b42164692f578cdf1202cbfd905f
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://dafemum.ru/strik?utm_term=specialised+cells+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_602aff4763b9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490001/normal_60019b2359d7b.pdfIn PDF document text
    • http://pedalini.club/31032020798u2j7k.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/hdieWEH/xizixonejoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459917/normal_6069eab1911b2.pdfIn PDF document text
    • https://cdn.sqhk.co/feneradebeza/jhSiehe/traffic_racer_bike_mod_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387581/normal_5fffb5a8cb728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_60435a0d40e50.pdfIn PDF document text
    • http://copyright-rules-help.com/lifejodefagozezesuxubup1lm8.pdfIn PDF document text
    • http://quickpapp.online/nekufarupevigejazobepjeo2w.pdfIn PDF document text
    • https://cdn.sqhk.co/pirasemofoge/djanwIl/infiltrate_the_cultist_base_slayer_gate.pdfIn PDF document text
    • https://cdn.sqhk.co/nalujujoso/8hdeowc/superhero_3_fighting_game_mod_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455178/normal_6000a319d756a.pdfIn PDF document text
    • http://electriccannoz.club/cowboy_corgi_breed_information98m8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448113/normal_6016c76cea068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_600aae76840a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410727/normal_5fda22e0302e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447097/normal_5ff227d687b83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457572/normal_5fedd91577f4e.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokonabat/WhgieNw/dumitekozetikomu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416321/normal_6001ef4b8bd9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9539bd6b-6144-4242-85bc-4f0c22fb7384/88562039483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15099935-490a-43fe-a7cd-63518a1163bc/potagitabupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de435eb-08cb-4825-8dfe-6e6af8ae0669/19489939697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b92726-d2f9-4346-815f-4464898fd631/tibetan_dream_yoga_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8670f8eb-ff93-4ddd-af17-8ebee268ea0f/68920917795.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 5420 bytes
SHA-256: 5b7d2c7741e578c9bc32ba609e5e59958b4f50d98ddcaf64e58f278d5019de67
font_01_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 10712 bytes
SHA-256: 8bbf92d1bbdac8546955618d3bc043c04933eee4076f492774821e4b55a5bfa6
font_02_sfnt_off000123ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AB 16088 bytes
SHA-256: a31bcf556e181db077c9b64db679e746f1af4c47e86886feaa6b1c1c5ec82d40

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