Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c52379f8248e6c…

MALICIOUS

PDF

73.0 KB Created: 2021-03-14 04:37:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 8165bb0544bb08a7e225cb5697b687c0 SHA-1: be77247d5fdfe43b82039fc28df612b5bcb77e0f SHA-256: 11c52379f8248e6c0e4f9837099c8e330f4f088e72be268bc4bbce0e0ef25d69
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a notable concentration on link farming and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links point towards an attempt to redirect users to malicious sites.

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://bologen.ru/wix?keyword=polycom+hdx+8000+manual+portugues PDF link annotation
    • https://mixifomako.weebly.com/uploads/1/3/1/1/131164472/6b0f8e7969fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_602c724b90dd2.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/26369161510.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/finbarr_barry_flood_iconoclasm.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/4030121047.pdfIn PDF document text
    • http://wigageturuv.mywebcommunity.org/2002_ford_explorer_tire_size_chart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464720/normal_5ffae47bde1bb.pdfIn PDF document text
    • https://kimidagox.weebly.com/uploads/1/3/4/4/134470984/tugitena.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/brother_intellifax_1270e_manual.pdfIn PDF document text
    • http://rokagovisalojop.iblogger.org/jimuzi.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://felixoxajaxev.epizy.com/55828136487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba915b04-dfb2-4d14-9c0c-7f1a5e258e66/75296649766.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/futowobesalukotami.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/wifi_hotspot_for_dell_laptop_free.pdfIn PDF document text
    • http://jowatazurusu.epizy.com/call_boy_jobs_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32d6c9bb-9ea4-428e-89a3-283354eec2c1/kidulel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30161f8d-9947-423a-bbb7-a9bf4dedf6ef/does_raw_apple_cider_vinegar_help_you_lose_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab6cefa-85b2-4981-ab36-7fdad258cbfa/17321920900.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_off0000d162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD162 5828 bytes
SHA-256: a21cceb31f7c7449b25785ebe45a6b5646841a015d0357bc0256012ce9825a77
font_01_sfnt_off0000e512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE512 10228 bytes
SHA-256: 9cacc29d8055ea12b7022f370395444d7a41b474ad507eeb9e5806de20105727
font_02_sfnt_off0001083f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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