Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1588183f292bd6…

MALICIOUS

PDF

75.7 KB Created: 2021-04-02 05:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ba946223df593a535392d62d8369ca07 SHA-1: 8074d5794b437d57334588f6f307c3b943ef00f2 SHA-256: 9c1588183f292bd6b5917f2abda310ea12de78e8b445447cbdf8dc64dee0bc57
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/award?keyword=catalogo+avon+campagna+13+pdf+2020 PDF link annotation
    • https://nububoreral.weebly.com/uploads/1/3/4/4/134467099/6404123.pdfIn PDF document text
    • http://mifukuvij.iblogger.org/62897108593.pdfIn PDF document text
    • https://zozolesib.weebly.com/uploads/1/3/4/6/134631165/6744533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_601c70f8675fc.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/8ijJgcT/idle_tap_bowling_hack_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496404/normal_5ff3e234140ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460233/normal_5ff68fd65b82a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490365/normal_5feaeeced8eb9.pdfIn PDF document text
    • https://cdn.sqhk.co/jejekije/jifwpJo/mezugidivaxagij.pdfIn PDF document text
    • https://sufidubiziden.weebly.com/uploads/1/3/4/7/134732268/darezemomara.pdfIn PDF document text
    • http://narosisebono.22web.org/cinetica_de_crecimiento_bacteriano.pdfIn PDF document text
    • https://cdn.sqhk.co/duvetezoje/kgiMsgj/4672854776.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_236df68648ac4d759a06df9cee72dc84.pdf?index=trueIn PDF document text
    • http://wetovokerug.epizy.com/yahoo_answers_pregnancy_questions.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_9425543f54b745808b1fd8d857b694be.pdf?index=trueIn PDF document text
    • http://jabenesejamuji.rf.gd/mitsubishi_1080_series_tv_reset.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_fc456143863b46efab63961227c2618c.pdf?index=trueIn PDF document text
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_e5b48a55ad564daebc327de43387d4bd.pdf?index=trueIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_0cc4501c50c845ebadce8ab5138853d0.pdf?index=trueIn PDF document text
    • http://firixafuzive.rf.gd/76728144026.pdfIn PDF document text
    • http://mijuguxugatuk.epizy.com/arduino_bahasa_indonesia.pdfIn PDF document text
    • http://wepaxilex.epizy.com/chrome_android_bottom_bar.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_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 5656 bytes
SHA-256: 59ec37c30dfe0d087f56c17ccc3e30f266b591b1d2efdce34b1084622f61eac1
font_01_sfnt_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 11788 bytes
SHA-256: 397cfd7369d85eb622066c1f79d3b69f35ef628c41c9b3e8c94a69d482352406