Malicious PDF — malware analysis report

Static analysis result for SHA-256 eace18a4bff8de9c…

MALICIOUS

PDF

74.3 KB Created: 2021-03-04 03:20:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bc1094e2a5a0547ca19ce313f86f912e SHA-1: f68bdf3552a9868ed6594d4c956fe83bf7462f74 SHA-256: eace18a4bff8de9c64935094d0b9d443b609ad5f630649a1b191734d8b670505
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains a query that could be used as a lure to disguise the malicious links.

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/123?utm_term=can+you+buy+houses+in+monopoly+when+it%2527s+not+your+turn PDF link annotation
    • http://xijulefabogi.getenjoyment.net/jaxumimovu.pdfIn PDF document text
    • https://cdn.sqhk.co/nepopagugela/uJhfgej/47248621749.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/76829520038.pdfIn PDF document text
    • http://gixotakopopunod.22web.org/98562113684.pdfIn PDF document text
    • http://galufixagomedo.getenjoyment.net/guzimuzaruxidux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368235/normal_5fece9ae8e103.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/xepaxotuf_xawifipij_sapitolabuper_fufapik.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/jiicZfj/pekimejivax.pdfIn PDF document text
    • https://cdn.sqhk.co/momugutatok/q1gdjfV/bowl_faster_exercises.pdfIn PDF document text
    • http://potaberukogox.66ghz.com/flight_search_engine_apps_for_android.pdfIn PDF document text
    • http://wukosemat.22web.org/resuguxap.pdfIn PDF document text
    • https://cdn.sqhk.co/kuruwoke/ig0igoq/is_it_love_ryan_your_virtual_relationships.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/nolalipanaxufujalukovegi.pdfIn PDF document text
    • http://seseletozub.iblogger.org/55135389064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465252/normal_5fe7cc201c088.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigegikotufevex.rf.gd/welexepivusokizumarep.pdfIn PDF document text
    • http://welididoseburiv.epizy.com/karuppusamy_kuthagaikarar_video_songs.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_off0000e3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 5332 bytes
SHA-256: dde8caec25773103a5207d050cf4b914a0ef1526b6786999402b623699d98f46
font_01_sfnt_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 10948 bytes
SHA-256: 4141c5bda87d11367138407999c06586079f220c4c489d7751612b6ca6ac6f77

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